1. 阅读短文，从每题所给的A、B、C和D四个选项中，选出最佳选项。

    The Earth is about 4, 600 million years old Man lives on the Earth for only 35, 000 years. But we change our Earth in many ways. Many things we do are good, but some are not good for the Earth.

    Water pollution

    A lot of people, birds and fish die each day because of water pollution. Factories pollute the water. As a result (因此), the water in many rivers and lakes is now very dirty.

    Air pollution

    In big cities, factories, cars and buses are the main causes of air pollution. Many people in cities now have health problems. For example, Mexico City used to be a beautiful sunny capital, but today there are many clouds in the sky. And many people get ill because of the polluted air.

    Soil (土壤) pollution

    In order to have a better harvest (收获), some of the farmers use chemicals too much in their fields. That's bad for the soil.

    Hope for the future

    These problems are very serious for our future, so all of us should do something to protect the environment. If we can stop pollution, our Earth will become more and more beautiful.

1. （1） How old is the Earth?

   A . About 4, 600 million years old. B . About 4, 500 million years old. C . About 4, 800 million years old. D . About 4, 700 million years old.
3. （2） ________ make the Earth change a lot.

   A . People B . Animals C . Plants D . Clouds
5. （3） Which of the following is NOT true according to the passage?

   A . Because of water pollution, a lot of people become healthier. B . We must stop the factories from putting waste water into the rivers and lakes. C . Because of water pollution, the water in many rivers is now dirty. D . Water pollution is very serious now.
7. （4） There are ________ kinds of pollution in t this passage.

   A . two B . three C . four D . five