The world is not only hungry but also thirsty for water. This may seem strange to you, since nearly 70%of the earth's surface is covered with water. But about 97%of that is sea water or salt water. Man can only drink and use the other 3%of fresh water from rivers, lakes, underground and so on. And we can not even use all of that because some of it has been made dirty.

    Earth Day is April 22. But on all other days, we must also remember how important water is. The water that we use is the most important natural resource on the earth. Today we face serious water problems. One of them is water pollution. All kinds of things from cars, factories, farms and homes make our rivers, lakes and oceans dirty. Polluted water is very bad for people to drink. And dirty water is bad for fish, too.

    How do cars and factories make our water dirty? First they pollute the air. Then when it rains, the rain water makes our drinking water dirty. Dirty rain, called acid rain(酸雨), is also bad for plants, animals and buildings. Scientists say that in 30 years, more than half of the people in the world won't have enough dean water. We have to learn how to stop wasting water. One of the first steps is to develop ways of reusing it. Today in most large cities, water i~ used only once and then sere out into a sewer system(下水道). From there it returns to the sea or goes underground.

    But even though every large city reused its water, we would still not have enough. So we should make use of sea water by removing the salt in it. If we can take these steps, fresh water won't be used up.

1. The world is thirsty for water because______.

Awe don't have enough fresh water

Ba lot of water goes into sewer systems

    Conly 70% of the earth's surface is water

    Dsea water is widely used rather than fresh water

2. The underlined word "face" means"______".

      Aturn the face down                         Bturn the face up

    Cturn the face to                            Dturn the face back

3. From this passage, we know acid rain________.

    Ais only bad for living things

Bis not bad for buildings and factories

Ccan be produced in factories

    Dis bad for people, animals, plants and buildings

4. One difficult way we can solve the problem is to ______.

Ause the water with salt in it                           Bremove the salt from sea water

Cget water from underground                         Dreuse the water in cities

5. What is the best title for this passage?

    AFresh water and sea water                           BA thirsty country

    CThe importance of water                            DThe world's water problem

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