人教版（2019）选择性必修四高中英语 Unit 2 Iconic Attractions 单元检测

More than two thirds of the world's polar bears will be wiped out by 2050, according to a shocking new study.By then, scientists say, global warming will have melted 42 percent of the Arctic sea ice.By 2100, only a very few of these important creatures will be left.

The report has been produced by the US Geological Survey.The scientists have publicized their findings in the hope of influencing US Interior Secretary Dirk Kempthorne, who has been asked to put polar bears on the US endangered species list.

Polar bears depend on floating sea ice as a platform for hunting seals, which are their main food.Without enough ice, polar bears would be forced to go onto the land, where they are poorly skilled hunters, and would be unlikely to adapt to the life on the land in time.Experts say few little bears would survive and the stress could make many females unable to get pregnant.

The team of American and Canadian scientists spent six months studying bears：on the ground, from spotter planes and in the lab, using computer models.Some team members fear the result is even worse for the bears than what their report says.They say the Arctic is warming faster than anywhere in the world and much faster than their computer has been forecasting.Satellite observations have showed that the ice has decreased to an all­time low.

However, not everyone in the scientific community believes that global warming is happening on such an alarming scale.Another investigation has found that polar bears are still being hunted by wealthy "sportsmen" who want their skins and heads.At least ten international companies offer bear­hunting trips.

There has been a lot of publicity recently surrounding 5G, the next generation of wireless technology for the world.But what is this technology and how might it change our lives?

5G stands for fifth generation, meaning the next step in the progression of technology to replace the current 4G system.4G was the replacement for 3G, which came after 2G, and so on.Earlier "G" systems were designed to improve mobile communication operations.Each new technology brought major improvements in speed and greatly increased network capacity(容量). The new 5G system promises more of the same.However, technology experts say there is a major way that 5G is different than the earlier systems.It will move well beyond mobile network technology to affect many more devices and industries than other "G" versions.

Wireless industry groups say 5G will help fuel future "smart cities" by connecting sensor(传感器) networks.5G is also expected to connect self­driving cars and support new technologies involving virtual reality.Higher 5G speeds could also permit doctors to commonly perform remote medical operations.Factories and businesses could use 5G technology to increase automation and improve the collection of information.

Every coin has two sides.Much of the data could contain private details about individuals, businesses or government organizations.The increased data flow would give Internet attackers a lot more possibilities to steal and misuse data.In addition, the wider use of a 5G wireless network means any breakdown of the system would have more widespread and severe results.Such difficulties could affect public safety as well as world economic activity.

Travel is one of the most exciting experiences a human being can have.Imagine how the Italian traveler Marco Polo must have felt when he found himself on Chinese soil, seeing a way of life quite different from what he'd seen before.And how marvelous(了不起的) it must have been to listen to Zhang Qian when he returned to China from his journey through Central Asia and West Asia！His brain must have been packed with everything he'd seen and heard, leading to the founding of the Silk Road.

Some people have traveled all over the world, and travel is a way of life for them.They perhaps know what to expect before they travel.That's why the best travel is the first one.Imagine a person who has always wanted to travel to the United States.Of course, he has probably seen the Statue of Liberty a thousand times on TV, and the White House, and all the other famous sights.But nothing would compare to the thrill of looking out of the cabin window(舷窗) as the plane lands, watching the buildings and streets of the real America come into view.

Although travel is often just for recreation, it's also educational.We may not know that we are getting an education, but we still are.

We're learning every day：new words in a new language, new people, and new ways of life.But this learning takes place in the school of the world, not the classroom.One of the lessons we learn is undoubtedly a moral one.As we get to know foreign places, we come to understand that there are many different ways to live, and that the way we live isn't necessarily the best.The British politician Benjamin Disraeli summed this up well when he said, "Travel teaches toleration."

One day in March, seven years ago, during happy hour at a bar in my hometown of Fayetteville, Arkansas, I made a surprising announcement to my friends：I was going to shut down my law practice and attempt to travel around the globe in a year.What's more, I would do it without taking any flights or making a single advance reservation of any kind.My announcement drew mixed reactions from my friends.Some offered support and encouragement, while others were more doubtful.

Once I had said the words, there was no turning back.It took months to shut down my law practice and get things in order.Once I set off on my adventure in December 2008, I found travelling without using planes was not easy.Trying to circle the globe in 16 months (it took me a bit longer than the initial 12 months I planned) made it even harder.Even so, travelling overland was the most amazing way to truly understand the immensity(浩瀚无际) of our wonderful planet.

I took three consecutive(连续的) overnight buses to travel 3,000 km through Argentina, from Ushuaia to the capital Buenos Aires.I would look out of the windows for hours on end at the completely unspoiled plains, as if humans had never touched it.

It took seven consecutive days and nights on trains to get from Moscow to Beijing, each day spent staring out of the windows for hours as the Siberian plains swept by.Sometimes, I wouldn't see a village or a human being for 10 hours.Later in my journey, it took 22 days on a cargo freighter(货船) to get from New Zealand through the Panama Canal and back to Philadelphia, to finish my round­the­world adventure.

It turned out that travelling with no reservations was far less difficult than I had imagined.Pulling into a city on a bus with a backpack, looking in a guidebook for a few suggestions of accommodations(住所), and then finding an empty room was never much of a problem anywhere.It also kept me flexible(灵活) and open about all my travel plans, which is advice I give everyone who asks—plan far less than you think you should.

A travel blog produces interest in people for visiting the new places. A blog owner might identify a place, such as travel locations within a small region of a country, or broaden the scope to include countries across the globe.Writing a travel blog requires recording notes and observations, taking pictures and talking to local people while traveling.Here are a few tips for writing a travel blog.

First of all, you must visit various places so that you can teach your visitors about these locations.Visitors of your site want an eye­catching text such that they feel as if they are at the place you're describing.

 Protect the reliability of your travel blog by proving all facts.Write down directions as you travel to various locations so that you can provide accurate information to readers.Provide the correct spelling of towns, people, restaurants and streets.Call phone numbers and visit website links before publishing to verify accuracy.

 As you travel, write down your impressions.After a memorable dining experience, for example, write down the name of the restaurant, the dish you ordered, its ingredients and the details of the decor and music.

You must add people's interview during the journey. The scent of rare flowers, the beautiful view from a mountain top, the feel of soft towels in a high­end hotel, and the sound of a waterfall are examples of descriptions that help people to connect immediately with a place or experience.

Take pictures.To help people see things with their own eyes, take pictures of all locations about which you wish to write.Local cuisines, landmarks, traditional clothing and scenic locations are possible examples.

Respond to readers' comments.Blogs typically allow you to accept or disable comments.Allowing comments is an opportunity to build rapport with readers and answer questions.

A. Keep a travel journal.

B. Record events on videos.

C. Provide correct facts.

D. Ask for submissions from other travelers.

E. Visiting gives mental satisfaction to all people.

F. Use the senses when writing about locations.

G. Take photos, posting the clearest and most bright pictures.

It has been five years.No one's quite sure how Sasha, the 6­year­old black cat, 1 it from Portland to New Mexico after five years.But apparently it isn't uncommon for cats—who are known for their 2 character—to go hitchhiking(搭便车).

"It's like he never left.He's so 3, " said its owner Usov."I guess he was on a great American 4."

When Sasha disappeared in 2014, Usov thought the cat might have 5wolves.But not every cat that disappears 6 a bad end.It's very common for a cat to 7 on a train or the back of a truck, but for a cat to travel 1,200 miles and then go back to its owner? That 8 happens.

Sasha's fur was matted(乱成一团的) when he was found 9 the streets by workers of the Santa Fe Animal Shelter this month.They set out to find his owner."Sasha didn't miss a meal, " Kirdar, a worker at the shelter, said.

The shelter reunites families with their 10 pets every day, 11this is the first time Kirdar has done an in­person delivery.Sasha's 12 would not have been possible if he had not been microchipped(植入微芯片).

"The microchip is the best form of 13, " said Kirdar.However, just getting your pet microchipped isn't enough.It's important to 14 the microchip's producer if there is a 15 in your contact information.

The Palace Museum, known as the Forbidden City, is the (large) and most well (reserve) imperial(皇帝的) residence in China today.It is divided into an outer and an inner court with a rectangular shape, 961 meters long from north to south and 753 meters in

(wide) from east to west.It has a splendid history since the Ming Dynasty, and it

(rebuild) and repaired many times in the past.I was so excited to visit it  my family last summer vacation.After we passed through the Front Gate, a lot of palaces appeared.The tour guide told us there were almost 8,700 rooms in the Palace Museum.During the Ming Dynasty, construction began in 1406.took 14 years to build the Forbidden City.I was

(real) surprised that the workers could build it so well even today it is not out of style.I could not remember all the names of the buildings, but I took hundreds of beautiful

(photo) on the way.I think I will never forget the (amaze) trip I had in Beijing, China and I can go there next time with my friends.

要点如下：

1）旅游目的地：罗拉多州(Colorado)；

原因：①风景优美(有激流、峡谷、森林等); ②便宜便捷(乘车约两小时可到)；

2）活动项目：国家公园宿营、河边野炊、垂钓、徒步、摄影、绘画等。

注意：

1）词数80左右；

2）信的开头和结尾已给出，不计入总词数。

Dear Peter,

……

Yours,

Li Hua

It was the hottest time of the year in southern California.Steve, a star basketball player at the University of California, with his cousin Zach, had planned a camping trip in the Great National Forest for their summer vacation.

The boys gathered clothes and supplies, and began their great adventure with Brady the dog early in the morning.Upon arrival, Steve pulled over to the side of the road along the bank of the river."A wonderful place for fishing, " Steve exclaimed in delight.Zach nodded in agreement.

At high noon, the sun was scorching hot.With a good harvest of fish, the boys marched into the forest with Brady following them.After a long walk, they found a clearing that was ideal for a campsite.The camp was set up immediately as Steve knew all the tricks of an experienced wilderness camper.

An afternoon nap was absolutely a special treat in mid­summer.However, the boys were waken up by the fierce barks of Brady.Outside, heavy smoke filled the air and wind­blown flame was skipping from the top of one tree to another.The long dry summer turned the forest into a tinderbox.In a little while, Steve and Zach were inside their tent packing their belongings.

"Let's go! We can make it back to the river!" They headed down against the fire­wind in the direction of the river.But Brady barked a sharp warning.Ahead of them lay a thick curtain of smoke across the track.They would never make it through that.Steve was uneasy for it was hard to find a safe way to escape in the heavy smoke.

Brady lifted his head and snuffed(嗅) the smoke­laden wind.Next moment, the dog bounded away and disappeared down a sharp slope(坡). The boys shouted for him, but he didn't come back.Steve couldn't blame Brady for panicking.He himself wanted to run even though he didn't know where to run.

注意：续写词数应为150左右。

Steve and Zach hadn't gone far when there was a familiar bark.

……

Brady pulled again, in spite of the boy's disbelief, urgently.