Unit 13 We're trying to save the earth! 知识点题库

    Learning about the environment is very important. There are many good books that will help you learn. To get started, ask your teacher or a librarian for some suggestions. You can also look at some good websites with information about the environment and climate change. Climate change may be a big problem, but there are many little things we can do to make a difference.

    Driving a car or using electricity is not wrong. We just have to be smart about it. Some people use less energy by carpooling . For example, four people can ride together in one car instead of driving four cars to work. Whenever we use electricity, we put greenhouse gases (气体)into the air. By turning off lights, the television, and the computer when they aren't needed, you can help a lot.

    Don't buy products that use too much energy. Some products, like certain cars, are made specially to save energy. These cars can travel longer on a smaller amount of gasoline. They don't pollute as much, either. Products like computers, TVs, and VCRs with the ENERGY STAR label (标签)Ⓒ are made to save energy. Buying products with these labels will help protect the environment. Buy recyclable products instead of non-recyclable ones. Recyclable products are usually made out of things that have already been used. It usually takes less energy to make recyclable products than to make new ones. So when you go shopping, look for the recycle mark on the package-three arrows that make a circle. The less energy we use, the better.

This kind of knife things.

    Andrew Holleman, a 12-year-old boy, loved playing in the open land near his home. The land was wet and forested, and made a home for birds, other animals and many different plants.

    It made the perfect place for him to study and get to know the nature. He had seen some red-tail hawks, red foxes, wood turtles and other animals. He also found special native flowers.

    Suddenly it was announced that the "empty" land would be improved by a lot of houses on it. The plants would be removed, the animals would run away and most would probably die. Then the wet soil would be covered with extra grounds.

    When he heard about the news, he was not happy. He was very worried that the land and water would be polluted.

    Andrew wrote down clearly all the research he had down about the area, and how the houses would affect the local environment. He sent letters to members of local government and television reporters. He also called on his neighbors to oppose the building of the houses.

    Although he was only 12 years old, he had the courage and wisdom of a person much older. Andrew' s teachers described him as gentle, shy and active. His classmates also admired how much he knew about local animals and plants, and the environment. Each day after school, Andrew went door-to-door, to ask the people to sign, who did not want the houses to be built. In only one month, he got the signatures of 250 people.

    In the end, the land remained a safe place for birds, animals and plants that belonged there.

    Andrew won many prizes for his brave and great work to stop the houses being built, and thus help save the environment.

have you thought about that problem?

    The Warrens are a common family.1, this common family has done something special.

    A few years ago, they2their big house in town and moved to the countryside. But that's not the only3thing that they did. They built a house which was powered (给……供电) by the wind and the sun in the country!

    Mr. Warren wanted his family to play a role in4the planet, so he read a lot about the electrical system. Then, he5to create electricity to power everything they needed for their daily lives. The kids were6at first. "Will we still be able to watch TV?" asked the daughter, Jane. "What about my computer?" asked James, the son. "Don't worry at all," said7father. "Just because we are going to create our own electricity doesn't mean we have to live in the8."

     "We are going to set up a wind generator (发电机) ," explained Mr. Warren. "Wind is a great way to9 electricity. It's not only free but also clean. The wind doesn't blow all the time, though. That's10we need to store (存储) our power. Then, when there is no wind, we will11have power to run everything in our house."

    Mr. Warren added, "We are also going to collect12from the sun and turn it into electricity. So, when the wind blows, we have power. When the sun13, we have power, too."

    It's easy to see that Mr. Warren really14renewable energy. And all his family hold the same15as him. Now, they are living happily in their self-powered countryside home.

—Yes. I like it very much.

I have to 150 dollars the sewing machine.

    Microplastics (微塑料) are small pieces of plastic that enter and pollute the environment. Microplastics are not a specific kind of plastic, but any type of plastic piece that is less than five millimeters (毫米) in length.

    The team, from South Korea's Incheon National University and Greenpeace East Asia, examined 39 brands of salt from 2l countries. Of these, 28 were sea salt, 9 were rock salt, and 2 were lake salt. Microplastics were not found in three of the samples (样品) : refined (精制的) sea salt from Taiwan, China, refined rock salt from Chinese mainland, and unrefined sea salt in France. Salt made in Asia had by far the most microplastics of all the samples, which has to do with where plastic most often enters the ocean. Nine of the top 10 sea salt are sampled with the highest amount of microplastics that come from Asia.

    Actually, microplastics are everywhere. Sea salt and lake salt are made by evaporating (蒸发) water and getting the salt that remains. Plastic waste comes into the bodies of water from rivers, so it's no surprise to find microplastics in salt. Scientists have been finding microplastics in salt for years, including in salt from countries in Asia, Europe, and Africa. But the latest study goes a step further, finding that looking at where the salt was produced is a good way to find how much plastic pollution is in that country.

    According to their results, the researchers said that an adult ingests (摄入) about 2,000 pieces of microplastics in salt per year. But microplastics in salt amount to about 6%of a person's total microplastics ingestion. Microplastics have also been found in water, fish and both indoor and outdoor air. All together, an adult ingests over 32,000 pieces of microplastics per year. 80% of them come into our bodies with the air.

    It's almost impossible for humans to avoid microplastic pollution.