Question

閱讀短文，掌握其大意，然后用方框內(nèi)所給的詞 的適當(dāng)形式填空，每個詞限用一次。

reuse	how	once	make	cover
stop	face	pollute	clean	drink

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 1    . with water. But about 97% of that is sea water, or salt water.

Earth Day is on April 22. But on all other days, we must also remember 2.      important    water is. The water that we use is the most important national resource on the earth. Today we 3.       serious water problems. One of them is water pollution. Polluted water is very bad for people to 4.     . And dirty water is bad for fish, too.

How do cars and factories make our water dirty? First they 5.      the    air. Then when it rains, the rain water 6.      our drinking water dirty. Dirty rain is also harmful to plants, animals and buildings. Scientists say that in 30 years, more than half of    the    people in    the world won ’ t have    enough 7.       water.    We all have to learn    how to 8.      wasting    water. One of the first    steps is to develop ways of 9.       it. Today in most large cities, water is used only 10.       and then sent out into a sewer system (下水道).From there it returns to sea or goes underground places.

Answer 1

 1. covered 2. how 3. face 4. drink 5. pollute

6. makes 7. clean 8. stop 9. reusing 10. once