题目内容
Water the young trees as often as possible, ________ they will die soon．
- A.so
- B.but
- C.or
- D.and
or否则，表示转折。
阅读快车系列答案In fact, 70% of Earth's surface is water. But most of 6 is sea water. We can't use salty water in our daily life. Fresh water is what we __7__ drink, take showers and cook food. And fresh water covers only 1 percent of Earth's surface. In some areas people try to make deep wells （水井） to get water from 8 . But there still 9 enough for farming. Scientists say that 10 30 years, more people in the world will face all kinds of water problems than now. So we must do something to take care of our water resources (资源).
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Right in the middle of the town are some long ponds(水池). They are only about half a foot deep. The men of Symi dug out the earth to make the ponds.
Over each pond is a low cover. It is made of glass that you can see through.
At night, sea water is taken into the ponds. The next day, the hot sun shines through the covers. The sun light turns the water into vapor(水蒸气) and the vapor goes up from the ponds. The salt is left behind.
As it goes, the vapor became mist. On the inside of each cover, the little drops of mist run together to make big drops. These drops run down the sides of the cover, filling other ponds with fresh water.
The salt left in the ponds is washed out each night. Then more sea water is taken in. The factory is ready for the next day's work. The covers and other parts of the factory cost very little. Sea water and sun cost nothing. Most people of Symi are poor. So to them this new way of getting fresh water seems wonderful.
1. Where are the little drops made into big drops?
A. On the inside of the covers.
B. In the ponds with fresh water.
C. On the walls of the salt water ponds.
D.Between the fresh water and the salt water.
2.The men of Symi dug some long ponds .
A. in order to keep sea water
B. in order to get hot water inside
C. in order to fill them with fresh
D. in order to get fresh water
3.Which picture shows the right way to get fresh water in Symi?
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4.Which of the following is NOT true?
A. The sea water is taken into the ponds at night every day.
B. There is a very big river running through the town to the sea.
C. The people in Symi can get fresh water from the factory.
D. People may see the water in the ponds through the cover.