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    Our earth is in trouble. Our drinking water is becoming dirtier, and the air is not as clear as before. People and factories are polluting the air, rivers, lakes and seas. You might think there is nothing you can do to help. That’s not true. There are many things you can do to help the earth.

    Cars burn gasoline. This will produce a lot of CO into the air. Some people believe that CO is making the earth warmer. They think CO thins the clouds above us. The clouds keep us away from the strongest sunlight. So try to walk, ride a bicycle or take a bus. And if you drive a car, drive at a steady speed. This can save some gasoline.

    The biggest energy use at home is for keeping warm or coo1.So turn the air conditioner off when you don’t need to use it. Use lights that save energy.

    Use fewer things that cannot be used again. When you buy something, consider those made from things that can be used again first.

    A lot of water is needed for a shower. In one week an American family uses as much water for showers as a person drinks in three years! Buy a waterworks that uses less water, or take shorter showers. This can cut the use of water.

    1. The writer thinks that we can do_________ for the earth.

      A. something        B. nothing         C. little             D. few things

    2. If there is too much CO in the air, the earth will become _________.

      A. 1arger           B. warmer         C. more colourful      D. colder

    3. The underlined word “thin” here means _______in Chinese.

      A. 稀薄的         B. 使……变稀薄   C. 瘦的              D. 使……变瘦

    4. We use the most energy at home for____.

      A. washing clothes                   B. having showers

      C. keeping quiet                     D. keeping warm or cold

    5. The writer suggests ________to save water.

      A. using milk to have a bath            B. showering once a week

      C. spending less time showering         D. using a big waterworks

    ABBDC

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