Earth Day is April 22. But on all other days, we must also remember it. The water we use is the most important natural resource（自然资源） on the earth.
Water covers 70% of the earth’s surface（表面）。 But most of that is sea water. We can’t use it for very many things. Fresh water covers only 1% of the earth’s surface.
You probably feel lucky that your life isn’t as hard as Napoga’s. But that doesn’t mean you don’t have to worry about water. We all 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. Now, 34% of all kinds of fish are dying out.
How do cars and factories make our water dirty? First, they pollute the air. Then, when it rains, the rain water comes down and 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 clean water. We have to learn how to save more water for ourselves and our children. Here is some advice for saving water:
●Turn off the water while you brush your teeth. You can save as much as 450 liters（升） each month.
●Leaky taps（漏水的龙头） waste a lot of water. Fix them right away!
●You can easily cut your 10-minute showers（沐浴） in half—and you’ll be just as clean.
●When you wash dishes, don’t let the water run.
●Only wash clothes when you have a lot to wash. If your washing machine isn’t full, you’re wasting water!
◆根据以上短文内容，然后从每题所给的四个选项中选择最佳选项。
1. Every morning Napoga went to get clean water _______.
A. before she went to school B. after she finished school
C without going to school D. after she played with her friends
2. On the earth, _______.
A. sea water is widely used than fresh water B. there is very little water for our living
C. there is 71% of fresh water D. we don’t need to worry about water
3. Acid rain _______.
A. is only bad for living things
B. can be produced in factories
C. doesn’t do harm to people, but it’s bad for plants, animals and buildings
D. doesn’t just do harm to human beings but to ani?mals, plants and buildings
4. Which of the following wastes water?
A. We need ten minutes if we want a clean shower.
B. We should put in enough clothes when we wash them in washing machines.
C. You can keep yourself clean by having a shower for five minutes.
D. Don’t let the water run when we brush our teeth and wash dishes.
5. What’s the main idea of the passage?
A. Something must be done to prevent water form be?ing polluted.
B. Clean water means much to human beings and living things around us.
C. It’s time to take care of the water we use.
D. Water is the most important natural resource on the earth.
【答案及解析】
1. 选C。从第1段中的句子She has no time to go to school可知，她根本没有去上学。故选C。
2. 选B。短文第3段中介绍了全球70%被水覆盖，但只有1%才是饮用淡水。而世界上的很多国家和地区都缺水。所以选B项，即我们的生活用水很少。
3. 选D。由第5段中的句子Dirty rain, called acid rain, is also bad for plants animals and buildings.可知，acid rain（酸雨）的危害很大。 故答案选D。
4. 选A。A选项与C选项相互矛盾，则必有一个为正确选项。而从第3点建议（advice）可知，你可以沐浴只须五分钟来节约用水，若用10分钟则是浪费水。故选A。
5. 选C。读完全文我们知道地球上的水资源有限，所以大家都要节约用水。故选C。
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