根据短文理解, 从A、B、C、D四个选项中选择最佳答案填空。

    Have you ever taken a tour of a zoo? If so, it's likely that the person who led you through the zoo helped you to learn a lot about the   1.

    Amelia Rinas is a high school student who lives in Ohio. One day Amelia 2   the Cleveland Metroparks Zoo. The moment she saw the gorillas there, she left 3  about them. She wondered if they were getting the right foods.

    Amelia read all she could about gorillas and learned what they like to 4 . Then she started a "gorilla garden". She grows the fruit and vegetables that gorillas love to eat. Some of those foods are tomatoes, carrots, and strawberries. Amelia works with other volunteers in her community who use their 5   time to help Amelia and the gorillas. When they take the food to the zoo, the gorillas are thrilled. They look so excited!

    Who is responsible for Amelia's interest in animals? Amelia is a member of Roots& Shoots. Its members are young people who   6   animals and the environment. They helped Amelia understand that animals need our care too. The slogan on the Roots &Shoots Website is "Inspire, take action, make a difference." These words tell  7 the group is all about. The group urges(力劝) kids and grown-ups, including parents and teachers, to do what they can to make a   8where they live.

    When interviewed about her project, Amelia said, "I joined Roots & Shoots  9    I wanted to make a difference in the world."

      There are many 10 to make a difference in the world. Amelia Rinas' gorilla garden has helped make gorillas happier and healthier.

    Elephants are the largest living animals on land. More than 5001 kinds of elephants were found on the earth over the last 55 million years. Only  2   kinds are still alive today: the African elephant and the Asian (or Indian) elephant. These elephants can only be found in  3   places. However, the older kinds lived in cold places a long time  4 . An example is the mammoth (猛犸象) — the largest hairy elephant.

    The mammoth was the largest living elephant, which was about seven tons. 5  the elephants today, mammoths had black or dark brown hairs 6 their bodies. All the mammoths had tusks (长牙).

    Scientists found most of the extinct (灭绝的) animals by 7  the fossils,  8  their bones and teeth that could be found. However, mammoths are quite different. During the Ice Age, mammoths died and were covered  9 in the ice. The ice kept them very well. So scientists could find the  10  body of the mammoth.

Dear human beings,

    Hi! I'm 80 years old now. So I've seen 1 of the world. We've lived on Earth with you thousands of years. Each day we release(释放) O₂ and remove harmful gas so that you have fresh 2; we help prevent the Earth's soil（土壤）from being washed away, and above all, we give all kinds of fruits, nuts, beans as well as 3 to you.

    We are now in great 4 because of you. You are killing us at a terrible speed. You are burning and cutting down millions of us each year, but you're not 5enough. For every tree being planted today, 30 trees are being cut down. What would you do if all of us 6? Perhaps you would die, too.7 us, you wouldn't get enough material for buildings, furniture（家具）, paper products, and your cities would 8ugly. Moreover, air pollution and noise pollution would become more and more serious, and your life would become nasty.

    The 9 thing for you to do now is to stop your bad manner. We are the best fighters 10 pollution and we are your best friends!  

Your friend,

An old tree

    How much do you know about the universe? In the huge universe, there is the Galaxy and many other galaxies. In the Galaxy, there is the Solar System and lots of other stars. In the Solar System, there is the sun, the earth and seven other planets. As we know, the eight planets go around their star —the sun. In our Earth—moon System, the moon goes around the earth. And because our earth keeps turning around the sun all the time, we have day and night. When our part of the earth turns to the sun, it is day. When our part of the earth turns away from the sun, it is night.

    Just because the moon is closer to the earth than the sun, it looks much bigger than the sun. The sun is big enough to give out very strong light. The moon itself can't give any light at all, but it looks quite bright, too. In fact, the light from the moon comes from the sun. Although, the moon looks much bigger and brighter than the sun and other stars, in fact, all the stars are much bigger and brighter than the moon. They look smaller than the moon also because they are farther away from us. It's clear that big things will look smaller when they are farther, and small things look bigger when they are nearer.

So far, we have traveled to many other planets in the universe. But scientists haven't discovered any living things on any other planets. Scientists haven't discovered any other planets with a good environment. They aren't sure if there is any water and air for living things to live on other planets. People always ask the question: Is there anyone out space? Our scientists haven't got a clear answer either. Some people think it will be a secret for a long time. But we believe we can solve the problem some day.

Exploring our Solar System and the universe is a great national project to some countries. Our Chinese scientists are also trying to send spaceships with astronauts to those planets and even the universe. At 9:00 a.m. on October 15th, 2003, a Chinese astronaut called Yang Liwei was sent up to space. He stayed there for hours and got back to the earth at 6:00 a.m. the next day. It was the first time for Chinese to have a space travel.

    There are many ways for us to reduce waste. For 1, we can reuse paper and plastic bags. We can also recycle newspapers, glass, and cans to2 new things. Here are some 3 ways to reduce waste.

Write on 4 sides of paper.

    Many people write on only one side of their paper. Why not stop 5the other side? Some students only use half the pages of their notebooks before getting new ones. Try to use up all the paper. People often give cards on birthdays or festivals. How about trying to 6 e-cards instead?

Don't throw away your old batteries (电池).

    Maybe you do not know that old batteries make the earth dirty. This is 7  they have poisonous parts in them. So, don't throw away batteries. Keep them together. Try to use rechargeable (充电的) batteries for your games and CD players.

    Give off all your unwanted clothes.

    There are many poor families in China. You may ask your mother to 8 your unwanted(多余的) 9. Then you can pass them on to those poor children. You will feel 10that you are helping someone else. Also, you can understand if your friends or relatives (亲戚) want them before throwing them away.

Orchids and the environment

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    F{#blank#}4{#/blank#} indoor orchids, it is much easier to control these conditions. For example, orchids usually need to be watered once a week, and you can control how much water you give to the plant. Also, many orchids grow best if they had indirect sunlight b{#blank#}5{#/blank#} direct sunlight will burn them. Indoor orchids can be placed near windows with curtains or blinds. This will protect them and give them the indirect sunlight they need.

    However, as to orchids that grow outdoors in the wild, global warming can become a threat. Unfortunately, global warming affects temperature, light and rain. All these factors will affect the way orchids live and grow. Most orchids will live c{#blank#}6{#/blank#} within a narrow temperature range of 18.3 to 23.8 degrees Celsius. Global warming can increase temperatures beyond the natural range for these flowers. Unfortunately, this can destroy orchids because they can't survive in hot, dry conditions. Second, air pollution can create acid rain. Acid rain is created when gases from fossil fuels combine with water in the air to form acids. When acid rain falls on plants and trees, it destroys the n{#blank#}7{#/blank#} balance of the soil and kills them.