Most of us have quite good memories, butour memories are limited. For example, we cannot remember everyone we have evermet or what we did on every single day of our lives. However, there are some people who do have prodigious memories. These people have a rare condition known as savant syndrome (学者症候群). Savants suffer from a developmental disorder, but they also exhibit great talents that contrast(显出差异) sharply with their physical and mental disabilities.

    Kim Peek (1951-2009) was a savant wholived in Salt Lake City, Utah, in the United States. He was born with damage to parts of his brain, but it seemed that other parts of his brain, particularly those relating to memory, became over-developed.

Peek's unique abilities appeared at avery early age. When he was just 20 months old, he could already remember every book that was read to him. Peek could read two pages of a book at the same time—one page with the right eye and one with the left—in less than 10 seconds and remember everything he read. By the time he died, Peek had memorized more than 9, 000 books. He could remember all the names and numbers ina variety of telephone books. He could remember thousands of facts about history, literature, geography and sports.

    Dr. David Treffert, an expert on savantsyndrome, once described Peek as “a living Google” because of his astonishing ability to memorize and connect facts. However, at the same time, Peek was unable to carry out simple tasks, such as brushing his hair or getting dressed, and he needed others to help him. In 1989, the movie Rain Man won the Oscar forbest Picture. The main character in the movie, played by Dustin Hoffman, wasbased on Kim Peek's life. He started to appear on television, where he would amaze audiences by correctly answering difficult questions on different topics. Peek became world famous, and he and his father began touring widely to talk about overcoming disabilities. He inspired a great many people with his words.“Recognizing and respecting differences in others, and treating everyone in the way you want them to treat you, will make our world a better place foreveryone. Everyone is different.”

    Wild weather, unexpected coral reefs and dangerous sea creatures… these are the nightmares (噩梦) you can imagine a teenager on a solo voyage (独自旅行) around the world might suffer from. But for Laura Dekker, sailing around the globe seems less a price to be paidthan a prize to be treasured.

    As the 19-year-old Dutch sailor said in Maidentrip, a documentary（纪录影片） released last year about her experience of becoming the youngest person to sail around the world alone in 2012, “I was born on a boat. I lived my first five years at sea. And ever since, all I have wanted is to return to that life.”

    With her yacht(游艇) Guppy, Dekker began her journey at 14 and sailed 50,004 kilometers in 519 days.

    The flying fish keeping her company, the dolphins following in her wake and the warm days spent on deck playing the flute (长笛) as she watched another unforgettable sunset were enough to make others jealous.

    But these didn't always go well. There were terrible moments in which Dekker feared death. On one occasion, a whale almost turned Guppy over. Another time, she battled extreme winds and Guppy surfed down 8-meter-high waves.

    Out on the open sea alone, she also got used to living without a fridge, a flushing（用水冲洗） toilet, and a hot shower.

   “As a human being you don't need much,”she told Stuff.co.nz. “ They might make life more comfortable, but you really don't need them to be happy.”

    In fact, her outlook on life was shaped by the trip. “I wanted the storms. I wanted the calms. I wanted to feel loneliness,”she told The New York Times. “And now I know all these things. It's the end ofthe dream I had as a child, and it's the beginning of my life as a sailor.”

    Before I studied psychology, I used to think that people would laugh when funny things occurred. While I was right about that, I discovered there are lots of other psychological factors that make people laugh other than the funny part of a joke. When someone laughs at a joke, there will usually be more than one reason that makes him laugh—and the more reasons there are, the more powerful the joke will be.

    I was attending a stand-up comedy show in Egypt, and when the man started to make fun of pedestrians crossing streets, everyone laughed their hearts out. The main reason those people strongly laughed was that almost all of them felt angry towards pedestrians who crossed streets carelessly. The joke wasn't only funny, it also made the audience feel that they were right about being angry at those pedestrians. That is, people were laughing both because of the funny joke and becauseof the happiness experienced as a result of the psychological support they got.

    The better a joke makes a person feel, and the more it includes other psychological factors, the more the person will like it. For example, if you envy one of your friends, and someone tells a joke that is funny and, at the same time, makes your friend seem stupid, then you will probably laugh at it louder than if you weren't jealous of him.

    In short, we don't laugh only when we hear something funny; we also laugh when we experience some kind of happiness that results from the other psychological factors involved in the joke. I strongly discourage making fun of anyone or be littling someone to make someone elselaug. All I want to explain is that if your joke supports a person's emotions, he will certainly like it a lot.

                                                          Music for Humans and Humpback Whales   

    As researchers conclude in Science, the love of music is not only a universal feature of the human species, but is also deeply fixed in complex structures of the human brain, and is far more ancientthan previously suspected.

    In the articles that discuss the field of bio-musicology, the study of the biological basis for the creation and appreciation of music, researchers present various evidence to show that music-making is at once an original human "business", and an art form with skillful performers throughout the animal kingdom.

    The new reports stress that humans hold no copy right on sound wisdom, and that a number of nonhuman animals produce what can rightly be called music, rather than random sound. Recentin-depth analyses of the songs sung by humpback whales show that, even when their organ would allow them to do otherwise, the animals converge on the same choices relating to sounds and beauty, and accept the same laws ofsong composition as those preferred by human musicians, and human ears, everywhere.

    For example, male humpback whales, who spend six months of each year doing little else but singing, use rhythms (节奏) similar to those found in human music and musical phrases of similar length—a few seconds. Whales areable to make sounds over a range of at least seven octaves (八度音阶), yet they tend to move on through a song in beautiful musical intervals, rather than moving forwards madly. They mix thesounds like drums and pure tones in a ratio (比例) which agrees with that heard in much western music. They also usea favorite technique of human singers, the so-called A-B-A form, in which a theme is stated, then developed, and then returned to in slightly revised form.

    Perhaps most impressive, humpback songs contain tunes that rhyme. "This suggests that whales use rhyme in the same way we do: as a technique in poem tohelp them remember complex material," the researchers write.

D

    I read somewhere that we spend a full third of our lives waiting. But where are we doing all of this waiting, and what does it mean to an impatient society like ours? To understand the issue, let's take a look at three types of “waits”.

    The very purest form of waiting is the Watched-Pot Wait. It is without doubt the most annoying of all. Take filling up the kitchen sink(洗碗池) as an example. There is absolutely nothing you can do while this is going on but keep both eyes fixed on the sink until it's full. During these waits, the brain slips away from the body and wanders about until the water runs over the edge of the counter and onto your socks. This kind of wait makes the waiter helpless and mindless.

    A cousin to the Watched-Pot Wait is the Forced Wait. This one requires a bit of discipline. Properly preparing packaged noodle soup requires a Forced Wait. Directions are very specific. “Bring three cups of water to boil, add mix, simmer three minutes, remove from heat, let stand five minutes.”I have my doubts that anyone has actually followed the procedures strictly. After all, Forced Waiting requires patience.

    Perhaps the most powerful type of waiting is the Lucky-Break Wait. This type of wait is unusual in that it is for the most part voluntary. Unlike the Forced Wait, which is also voluntary, waiting for your lucky break does not necessarily mean that it will happen.

    Turning one's life into a waiting game requires faith and hope, and is strictly for the optimists among us. On the surface it seems as ridiculous as following the directions on soup mixes, but the Lucky-Break Wait well serves those who are willing to do it. As long as one doesn't come to rely on it, wishing for a few good things to happen never hurts anybody.

    We certainly do spend a good deal of our time waiting. The next time you're standing at the sink waiting for it to fill while cooking noodle soup that you'll have to eat until a large bag of cash falls out of the sky, don't be desperate. You're probably just as busy as the next guy.

    “Is there anything else you need, honey？” my dad asked  me as he put three twenty­dollar bills in my hand. I was traveling  back home from a family visit, and after treating me to breakfast  and filling my car with gas, it was obvious that my dad wanted  to make sure that I would be okay on the road.

    “No, Dad. You've done so much already. Thank you！” I was overwhelmed once again by his kind acts of providing  everything I needed, despite the fact I just turned 40. Yet I realize that in my father's eyes, I will always be his little girl. He takes deep pleasure in knowing his children are all right.  Now that he has enough money, he loves to give whenever he  sees a need.

    But this was not always the case.  Divorced from my mother when I was 11, my dad couldn't be around his kids as  often as he would have liked. Money was also tight; even weekend visits were rare. However, my dad stayed in constant  communication with us and made sure he was involved in our lives. Though he couldn't always be there in person, I knew  he was only a phone call away. I could always count on that.

    Even now, almost 30 years later, I treasure knowing that I can pick up the phone and call Dad, and he'll be there for me. I have a wonderful husband, but that hasn't changed how   Dad sees me. I'm still his child and he loves to see that my   needs are met.

    I remember a time when I was shopping in a hardware store(五金店)with Dad. I mentioned my plans to paint one wall in my house. Well, that's all it took for Dad to take   action. By the time I got to the checkout(结账) line, all the supplies I picked out were put out of my hands and placed with things he bought.

    Then there was the time when I took him with me to do some grocery shopping for just a few “ items”. By the time we  were finished, my shopping cart was full of groceries from  every shelf in the store! My sister and I joke that if you don't want Dad to buy it for you, avoid even mentioning you want something.

    Hummingbirds(蜂鸟) are one of nature's most energetic fliers and the only birds to hover(盘旋) in the air by relying on their strength alone.

    Now scientists have found that it is the ratio(比值) of the bird's wing length to its width that makes them so efficient. The discovery is helping experts compete with 42 million years of natural selection to build helicopters that are increasingly efficient.

    David Lentink, an assistant professor at Stanford University in California, tested wings from 12 different species of hummingbirds, which he sourced from museums. He placed them on a machine used to test the aerodynamics(气力学) of the helicopter blades(桨叶). Professor Lentink's team used the same machine to test the blades from an advanced micro-helicopter used by the UK's army. They found that the micro-helicopter's blades are as efficient at hovering as the average hummingbirds.

    But while the micro-helicopter's blades kept pace with the average hummingbird wings, they could not keep up with the most efficient hummingbird's wing. The wings of Anna's hummingbird were found to be about 27 percent more efficient than the man-made micro- helicopter's blades.

    While Professor Lentink wasn't surprised at nature's superiority, he said that helicopter blades have come a long way. “The technology is at the level of an average hummingbird,” he said. “A helicopter is really the most efficient hovering device that we can build. The best hummingbirds are still better, but I think it's amazing that we're getting closer. It's not easy to match their performance, but if we build better wings with better shapes, we might match hummingbirds.”

    Professor Lentink said that we don't know how hummingbirds maintain their flight in a strong wind, how they navigate(确定方向) through branches, or how they change direction so quickly. He thinks that great steps could be made by studying wing aspect ratios-the ratio of wing length to wing width. Understanding these abilities and characteristics could be a benefit for robotics and will be the focus of future experiments.

根据短文内容，选择最佳答案，并将选定答案的字母标号填在题前括号内。

The Diet Zone: A Dangerous Place

    Diet Coke ,diet Pepsi, diet pills, no-fat diet, vegetable diet…We are surrounded by the word “diet” everywhere we look and listen. We have so easily been attracted by the promise and potential of diet products that we have stopped thinking about what diet products are doing to us. We are paying for products that harm us psychologically and physically.

    Diet products significantly weaken us psychologically. On one level, we are not allowing our brain to admit that our weight problems lie not in actually losing the weight, but in controlling the consumption of fatty, high-calorie, unhealthy foods. Diet products allow us to jump over the thinking stage and go straight for the scale instead. All we have to do is to swallow or recognize the word “diet” in food labels.

    On another level, diet products have greater psychological effects. Every time we have a zero-calorie drink,we are telling ourselves without our awareness that we don't have to work to get results. Diet products make people believe that gain comes without pain, and that life can be without resistance and struggle.

    The danger of diet products lees not only in the psychological effects they have on us, but also in the physical harm that they cause. Diet foods can indirectly harm our bodies because consuming them instead of healthy foods means we are preventing our bodies from having basic nutrients. Diet foods and diet pills contain zero calorie only because the diet industry has created chemicals to produce these wonder products. Diet products my not be nutritional,and the chemicals that go into diet products are potentially dangerous.

    Now that we are aware of the effects that diet products have on us, it is time to seriously think about buying them. Losing weight lies in the power of minds, not in the power of chemicals. Once we realize this, we will be much better able to resist diet products, and therefore prevent the psychological harm that comes from using them.

根据短文内容，选择最佳答案，并将选定答案的字母标号填在题前括号内。

    Hummingbirds(蜂鸟) are one of nature's most energetic fliers and the only birds to hover(盘旋) in the air by relying on their strength alone.

    Now scientists have found that it is the ratio(比值) of the bird's wing length to its width that makes them so efficient. The discovery is helping experts compete with 42 million years of natural selection to build helicopters that are increasingly efficient.

    David Lentink, an assistant professor at Stanford University in California, tested wings from 12 different species of hummingbirds, which he sourced from museums. He placed them on a machine used to test the aerodynamics(气力学) of the helicopter blades(桨叶). Professor Lentink's team used the same machine to test the blades from an advanced micro-helicopter used by the UK's army. They found that the micro-helicopter's blades are as efficient at hovering as the average hummingbirds.

    But while the micro-helicopter's blades kept pace with the average hummingbird wings, they could not keep up with the most efficient hummingbird's wing. The wings of Anna's hummingbird were found to be about 27 percent more efficient than the man-made micro- helicopter's blades.

    While Professor Lentink wasn't surprised at nature's superiority, he said that helicopter blades have come a long way. “The technology is at the level of an average hummingbird,” he said. “A helicopter is really the most efficient hovering device that we can build. The best hummingbirds are still better, but I think it's amazing that we're getting closer. It's not easy to match their performance, but if we build better wings with better shapes, we might match hummingbirds.”

    Professor Lentink said that we don't know how hummingbirds maintain their flight in a strong wind, how they navigate(确定方向) through branches, or how they change direction so quickly. He thinks that great steps could be made by studying wing aspect ratios-the ratio of wing length to wing width. Understanding these abilities and characteristics could be a benefit for robotics and will be the focus of future experiments.

根据短文内容，选择最佳答案，并将选定答案的字母标号填在题前括号内.

    Tea，the most typical English drink，became established in Britain because of the influence of a foreign princess，Catherine of Braganza，the queen of Charles II．As a lover of tea since her childhood in Portugal，she brought tea-drinking to the English royal court and set a trend for the beverage in the 17th century．The fashion soon spread beyond the circle of the nobility to the middle classes，and tea became a popular drink at the London coffee houses where people met to do business and discuss events of the day．Many employers served a cup of tea to their workers in the middle of the morning，thus inventing a lasting British institution，the“tea break”. However，drinking tea in social settings outside the workplace was beyond the means of the majority of British people．It came with a high price tag and tea was taxed as well．

    Around 1 800，the seventh Duchess of Bedford，Anne Maria，began the popular practice of“afternoon tea，”a ceremony taking place at about four o'clock．Until then，people did not usually eat or drink anything between lunch and dinner．At approximately the same time，the Earl of Sandwich popularized a new way of eating bread—in thin slices，with something like jam or cucumbers between them．Before long，a small meal at the end of the afternoon，involving tea and sandwiches，had become part of the British way of life．

    As tea became much cheaper during the 19th century，its popularity spread right through all corners of the British society．Thus，tea became Britain's favorite drink．In working-class households，it was served with the main meal of the day，eaten when workers returned home after a day's labor．This meal has become known as“high tea”．Today，tea can be drunk at any time of the day，and accounts for over two-fifths of all drinks consumed in Britain-with the exception of water．

    Adults are happy to tell their children that crusts (面包皮) will give them curly hair, carrots will help them see in the dark, and spinach will make them strong. Even though adults know it's not totally true, they think it's good for their children's health, a study had found.

    In a study about 31 per cent of adults said they once told their children the curly hair tale, and 36 per cent said they'd been told the same thing by their mother or father. Among the over-50s, almost half said they'd been promised curly hair if they ate their crusts. A quarter of the 2,000 adults questioned in the study told their children carrots would help them see in the dark. This could be true to some extent because of the high levels of vitamin A and beta-carotene in root vegetables.

    Another favorite among parents is that milk will make one strong. A third surveyed said their parents told them this, and about 29 per cent said they told their children the same thing. But while there is plenty of evidence to suggest milk is good for people's health, there are also a lot of scientific papers saying it isn't.

    Thanks to Popeye, spinach is also fed to children, along with the idea that it will make them strong. While there is also some truth in this one, scientists now believe it is not the iron, but the inorganic nitrates (无机硝酸盐) that improve physical power.

    One in seven of the surveyed admitted telling their little ones that runner beans will make them run faster, which is nothing more than wordplay and has no basis in science. Almost one in five adults were subjected to the same tale in childhood.

    Just over one in 10 parents told their children green food would turn them into a superhero, and a quarter admitted hiding vegetables in meals.

    Lyndsay Jones, spokesman for Persil Washing Up Liquid, said, "It's clear that the most persuasive stories about food are passed on from generation to generation. Our research shows that the ideas continue, and we tell our kids the same things our parents told us, even if they're not always entirely true."

    Crusts may not make your hair curly, but there's plenty of research that says crusts contain more of the goodness than the rest of a loaf. Hopefully, as a result of our Cook with Kids promise, more parents will be encouraged to spend time with their children in the kitchen and teach them the truth about food.

    The Loss of Innocence

    Innocence is such a precious gift. It's explained as freedom from guilt or wrong doing. Just imagine never having to worry about anything and having a guilt free mind. Some people wish to save this kind of innocence from being lost from childhood to adulthood.

    What would the world be like if innocence were never lost? One way it would benefit humanity is the lack of hatred （仇恨）among the world. During youth, there may be an occasional argument, even a little physical fight, but nothing like firing a handgun at a fellow human being. And children are blind towards the racial differences of others. A kid will hang out with any other kid. It is the lack of innocence and the ignorance we learn from adults that influence children otherwise. Another benefit is the constant desire for fun and adventure. With very little if any time at all for fun，the adventurous mind is lost in time with the responsibilities placed upon adults. If innocence were kept alive, these ambitions would never depart from our lives.

    However, other people actually hate the idea of innocence lasting forever. They feel that the lack of organization and mental power of those with innocence would cause extremely destructive consequences to society in general. A large number of individuals would never have the urge to learn, work, and act upon the necessary needs for humanity to survive. Without a proper education which is usually provided by those who no longer live in a world of innocence, people would not have the desire to succeed, get a good job in life, or provide income for their families, which would hurt the lives of children.

    The lack of a good education and career would also harm the economy. As long as innocence is kept alive, no one would be terribly angered at the lack of effort people put out in the workplace, resulting in a strong decline in production and quality of needed goods.

    Maybe it is wrong in wanting to save innocence. It sure is a nice thought, though. Perhaps innocence was meant to be lost. It was God's will to make things the way they are, and there is a good purpose for everything. All that remains to be said about innocence is to enjoy it while it lasts.

    Floods are second only to fire as the most common of all natural disasters.They occur almost everywhere in the world,resulting in widespread damage and even death.Consequently,scientists have long tried to perfect their ability to predict floods.So far,the best that scientists can do is to recognize the potential for flooding in certain conditions. There are a number of conditions,from deep snow on the ground to human error,which cause flooding.

    When deep snow melts it creates a large amount of water.Although deep snow alone rarely causes floods,when it occurs together with heavy rain and sudden warmer weather it can lead to serious flooding.If there is a fast snow melt on top of frozen or very wet ground,flooding is more likely to occur than when the ground is not frozen.Frozen ground or ground that is very wet cannot absorb the additional water created by the melting snow.Melting snow also contributes to high water levels in rivers and streams.

    Rivers that are covered in ice can also lead to flooding.When ice begins to melt,the surface of the ice cracks and breaks into large pieces.These pieces of ice move and float down the river,They can form a dam in the river,causing the water behind the dam to rise and flood the land upstream.If the dam breaks suddenly,then the large amount of water held behind the dam can flood the areas downstream too.

    Broken ice dams are not the only dam problems that can cause flooding.When a large human-made dam breaks or fails to hold the water collected behind it,the results can be devastating.Dams contain such huge amounts of water behind them that when sudden breaks occur,the great force of the water is like a great tidal wave.The dam waters can travel tens of kilometres,cover the ground in metres of mud and litter,and drown and crush every thing and creature in their path.

    Although scientists cannot always predict exactly when floods will occur,they do know a great deal about when floods are probably going to occur.Deep snow,ice-covered rivers,and weak dams are all strong conditions for potential flooding.

    Careers in zoology are extremely varied and unique, and can provide incredible learning and work opportunities for anyone devoted to animal studies and welfare. Zoology, or the study of animals, is a wide field with many specialties, including research, conservation, veterinary (兽医的) medicine, and the care of animals. For people with a love of animals and some training, dreams of careers in zoology may come true.

    Some careers in zoology focus on research and scientific studies. These careers may allow those with a good theoretical science background to develop and run studies that improve human understanding of the animal world. Research in zoology can help create safer and more effective products for animals or can teach humans more about animal behavior in order to aid in conservation, breeding programs, and habitat preservation.

    Careers in zoology that focus on conservation attach great importance to the continued survival and increased protection of animal species. Conservationists may work with political groups or governments to help make laws to protect and preserve animals, or may work in the field gathering information on potential threats to the health of global ecosystems. Some conservationists work in educational fields, trying to improve human efforts to save animals from extinction.

    Animals are subject to illness and injury, and some careers in zoology help to create a safe, stable animal population. Veterinary medicine is an important specialty field, and may take several years of intensive training to qualify as a certified veterinarian. While many veterinarians focus on the small-animal practice of domestic pets, vets in rural areas often work with large farm animals and more adventurous veterinarians may work with exotic species in zoos and wildlife preserves. .

    Humans love to observe animals, and modern-day zoos and wildlife preserves help meet that interest while providing facilities to assist with conservation programs. Zoology careers in zoos can range from overseeing breeding programs, to creating the proper diet for a deer, to cleaning the tiger's cage. Many volunteer and entry-level jobs are available for people that love animals.

    There are many places to go on safari in Africa, but riding a horse through the flooded waters of Botswana's Okavango Delta must rank as one of the world's most exciting wildlife journeys.

    Several safari camps operate as the base for this adventure, providing unique rides twice a day to explore deep into the delta. The camps have excellent horses, professional guides and lots of support workers. They have a reputation for providing a great riding experience.

    The morning ride, when the guides take you to beautiful, shallow lakes full of water lilies, tends to be more active. It is unlike any other riding experience. With rainbows forming in the splashing water around you and the sound of huge drops of water bouncing off your body and face. It is truly exciting. You are very likely to come across large wild animals, too. On horseback it is possible to get quite close to elephants, giraffes and many other animals. The sense of excitement and tension levels rise suddenly though, as does your heart rate, as you move closer to them.

    In the evening, rides are usually at a more relaxed and unhurried pace. With golden light streaming across the grassy delta and the animals coming out to eat and drink. Sedate though they are, rides at this time of day are still very impressive. As the sun's rays pass through the dust kicked up by the horses, the romance of Africa comes to life.

    Back at the camp you can kick off your boots and enjoy excellent food and wine. Looking back on your day, you will find it hard to deny that a horseback Safari is as close as you will ever come to answering the call of the wild.

    Imagine a town with crosswalks but no pedestrians, cars and trucks but no drivers. Welcome to Mcity, a fake “city” built by researchers who are testing out the driverless cars of the future.

    The controlled test environment, which opened today (July 20, 2015) at the University of Michigan in Ann Arbor, covers 32 acres (the size of about 24 football fields) and contains all the trappings of a real suburb or small city. There is an entire network of roads lined with sidewalks, streetlights, stop signs and traffic signals. There's even a “downtown” area complete with fake buildings and outdoor dining areas.

    The idea behind Mcity is simple: test out new driverless car innovations in a human-free environment before these technologies are unleashed in the real world.

    "Mcity is a safe, controlled, and realistic environment where we are going to figure out how the incredible potential of connected and automated vehicles can be realized quickly, efficiently and safely," Peter Sweatman, director of the Mobility Transformation Center at U-M, said in a statement.

    The roads of Mcity are built to stand up to “rigorous, repeatable” testing, according to MTC officials. While Mcity drivers don't have to compete with real pedestrians, there will be one mechanical foot-traveler (a robot-like machine named Sebastian) that steps out into traffic to see whether the automated cars can hit the brakes in time. The fake city also features a traffic circle, a bridge, a tunnel, some unpaved roads, and even a four-lane highway with entrance and exit ramps, according to a report by Bloomberg Business.

    In addition to evaluating fully automated, or driverless cars, the researchers also hope to test out so-called connected vehicles within Mcity's limits. Connected cars can either communicate with one another (vehicle-to-vehicle control, or V2V) or with pieces of equipment, such as traffic lights, that are located near roadways (vehicle-to-infrastructure control, or V2I).

    Even the smallest details of Mcity have been planned out in advance to copy the conditions that connected and automated vehicles could face in the real world. For example, there are street signs covered up with graffiti, and faded yellow and white lane markings line the streets.

    Mcity is just one part of a much larger project that MTC and its partner organizations are establishing in an effort to get a whole fleet of connected and driverless cars on the road in Ann Arbor by 2021. In addition to the fake city, MTC is also continuing to launch connected and semi-autonomous(半自动) cars on real roadways. Eventually, the University of Michigan and the Michigan Department of Transportation said they hope to put 20,000 connected cars on the roads of southern Michigan.

    As I enter my 40s, I've noticed many of my parents' generation think social networking is something they are simply unable to understand. They fear that, should they try, they will somehow get it wrong; they will say the wrong thing, do the wrong thing or behave in a way that causes embarrassment. But there are some secrets of social media for them to consider.

    Here's the first secret: everyone feels this way. I recently met a young actor who was complaining that her work demands that she join Microblog, but she always feels like she doesn't have anything smart to say. It's the same resistance (抵制). I hear from the older generation, who, however, have somehow believed that age is the barrier (障碍), rather than the differences of personal taste.

    Here's the second secret: everybody uses it for more or less the same reasons. Older generations often sign up to stay in touch with children and relatives. We talk about this kind of communication like it's some old-fashioned activity, but it is exactly why younger people use social media. The truth is that most people use social media to gently keep an eye on one another, to see how those they care about are doing without needing to ring them up on the phone every night.

    And this is the last secret: everyone gets to use them in their own way. Newcomers—younger and older—who worry about “getting it right” are thinking that there's a right way to get them. But actually there isn't. Personally, I talk a lot on Microblog. And some people post nothing and they use social media every day as readers. Social media companies would rather see people decorating their networks with pictures and posts, but there's no rule against being a fly on the wall. It's also a fine way to get involved.

    Were quick to forget that the web wasn't invented by 13-year-olds; it was created by today's seniors. I'd never try forcing those with no interest in social networks to use Microblog. But don't let the talk of age divides put you off. There's nothing to stop the older generation from joining in the network their own generation created.

    OK, so it's not a real war but the U. S. and China are at the beginning of a trade war thanks to President Trump's policy. The Chinese government raised $34 billion in new duties on goods exported from the U.S. last week in answer to President Trump's unwise tariffs(关税) of $34 billion on Chinese goods.

    Farm and seafood-producing states are going to be hit hardest by China's new tariffs on U. S. goods. States where cars are made and shipped to China are on the hook as well.

    In terms of value, some 38 percent of products on the tariff list are agricultural, including soybeans, sorghum, tobacco and meat. That's nothing like good news for farm-belt states, primarily in the Midwest like Iowa.

    A wide range of seafood is on China's tarifflist. That could hurt fishery workers in Alaska and lobster(龙虾) harvesters in Maine. Alaska, for example, exported nearly $lbillion worth of seafood to China. "China is a major market for Alaska seafood," said Alexa Tonkovich, Executive Director of the Alaska Seafood Marketing Institute. "The seafood industry directly employs nearly 60,000 workers in Alaska each year and directly employs more workers than any other private industry."

    And automaking States, particularly in the South, are also at risk. Some 24 percent ofproducts on the list- in terms of value-are cars, trucks and other vehicles. Michigan alone exported $1.7 billion worth of motor vehicles and vehicle parts to China in 2017. Other states being affected include South Carolina, where BMW makes SUVs for both the U.S. and export, and Alabama, home to Mercedes-Benz, Toyota, Honda and Hyundai factories.

    This round of tariffs spares some industries, like commercial aircraft. Washington State could breathe a sigh of relief, which is home to Boeing. It also, for the moment, skips tariffs on chemical products.

    Alexa Tonkovich has warned the U.S. government that the trade war could risk jobs, reduce industry profits, and cause higher prices for consumers in the U.S!

Being a successful high school student

Being a successful high school student requires both patience and motivation. Unfortunately, there are often many things that can make your success difficult. Here are some tips which can help you become a successful high school student.

Remember that school is important.

It's important to have fun and have lots of extra after school activities, but school study should always be your top priority (优先的事物).

Get involved at your school.

You don't have to be a superstar or a cheerleader to do this.  These may include recent events, such as the basketball game held last Friday or attending school events like dances and variety shows.

Take up a sport to get fit.

It's easy to forget to stay in shape when the workload gets heavy.  So join a sports team at your school to make you less worried about your schedule and have a healthy body.

Not being an athlete is not an excuse for not having something to do after school. If you're interested in art, join the art club. Music? Join a band. If you're not into any of your school's clubs, advise your principal to start a new one. Most likely he or she will say yes.

Focus on yourself.

Don't compare yourself with others.  Every day you should only try to make yourself better, instead of worrying about how the girl sitting in front of you has nicer clothes or is getting better grades, etc. Ten years from now, this won't matter.

A. Join all kinds of clubs.

B. Find a club to develop your interests.

C. All you need to do is stay on top of things.

D. High school is only a competition with yourself.

E. So never take homework, tests and quizzes lightly!

F. Changing your attitude towards study can contribute to your success.

G. Doing some sports can help you relax your body and improve your study.

Many experts say that Billy Wilder changed the history of American movies. He is often called the best movie maker Hollywood has ever had.

He was known for making movies that offered sharp social comment. Wilder was one of the first directors to do this. Between the middle 1930s and the 1980s, Billy Wilder made almost fifty movies. During that time he received more than twenty nominations (提名) from the Academy of Motion Picture Arts and Sciences. He won six of the Oscar awards. His movies have been seen by people around the world.

In 1944, Billy Wilder made the film Double Indemnity. Some critics said this movie established him as one of the greatest Hollywood directors. Wilder directed The Lost Weekend in 1945. Ray Milland plays the part of an alcoholic writer in the movie. It shows that alcohol rules his life, yet he does not admit it. He hides alcohol in his home and says he is not drinking.

In 1950, Wilder made Sunset Boulevard. This movie told of an aging actress in silent movies. She plans to return to movies though facing many problems. In 1954, Billy Wilder became an independent producer. The next year, Wilder's first movie as an independent filmmaker was a huge success. It was Seven Year Itch. In this movie, a married mailman wants to cheat on his wife with some of his friends. In 1959, Wilder made a funny movie that was very popular. It was Some Like It Hot. It tells about two jazz musicians being chased by criminals. They decide to wear women's clothes and join a band in which all the musicians were women.

Wilder died in March, 2002. He was ninety­five. A current Hollywood producer said："Billy Wilder made movies that people will never forget. "