网址：http://m.1010jiajiao.com/timu3_id_2397548[举报]
or salt water. Man can only drink or use the other 3％of the fresh water (淡水) which comes from rivers,
lakes and underground. On the other hand, because the number of people in the world is becoming larger and
larger, more and more fresh water is needed. So water shortage becomes a big problem.
How can we work out this problem? Scientists have found some ways to turn salt water into fresh water.
One important way is to boil (使达到沸点) sea water with high heat until vapor (蒸汽) rises, leaving the salt. In
this way, a lot of fresh water can be made quickly.
But heating is not the only way to get fresh water. Other ways are tried, for example, digging (挖) deep wells
(深井), keeping rain water and preventing rivers from being polluted.
Which way is the best? To get the most fresh water for the least money is the best.
B. Rivers and lakes.
C. Underground.
D. Both B and C.
B. can be used in many ways
C. can be found in many factories
D. is needed by more and more people
B. being short of
C. being short for
D. being less
B. How to use fresh water in our daily life.
C. All people in the world should save water.
D. Different ways of making water in different places.
B. Water shortage is the only problem in our world.
C. Scientists don't want to spend money solving the water problem.
D. Scientists have been working hard and have made much progress in solving water problem.
The world is not only hungry, it is also thirsty for water. This may seem strange to you, since nearly 75% of the earth is covered with water. But about 97% of this water is sea water. Man can only drink and use the other 3% fresh water that comes from rivers, lakes, underground and other places. And we cannot even use all of that, because some of this fresh water has been made dirty.
At the moment, this small amount (数量) of fresh water is still enough for us. However, our need for water is getting greater and greater. Only if we take steps to solve this problem now, we can get away from a serious world water shortage later on. The people of the world cannot have an enjoyable life without enough clean water.
On one hand we should stop wasting this little water of ours, on the other hand we should find ways to reuse it, but this has not been done widely.
Today, in most large cities, water is used only once and it then returns to the sea or runs into underground places. If we can make it clean again, it can be used once more just as if it were fresh from a spring.
But even if large cities reuse its water, we still would not have enough in the future. Where could we turn to next for water? To the ocean! How can we do to make use of this great amount of sea water? We can take the salt from the water to make it fresh.
So if we take all these steps, we’ll be in no danger of drying up!
1. Why does the writer say that the world is thirsty for water?
A. The amount of fresh water is really very small.
B. The people of the world waste too much water.
C. The people of the world have to drink a lot of water every day.
D. There are too many people in the world needing water.
2. From the passage we know that fresh water doesn’t come from _________.
A. rivers B. lakes C. underground D. the sea
3. The underlined word shortage in the second paragraph means _______in Chinese.
A. 问题 B. 短龄 C. 缺乏 D. 资源
4. The writer thinks that people in large cities should __________.
A. stop the used water from getting into underground
B. only use the water from the rivers
C. make their used water clean again
D. use as much sea water as possible
5. In order to solve the problem of water shortage, we have to __________.
a. make use of sea water on the earth.
b. save as much fresh water as possible
c. reuse the water from large cities
d. stop people from using too much water
e. only use the 3% of the water on the earth
A. a and e B. a, b and c C. b, c and d D. a, b and d
查看习题详情和答案>>