[单项选择]

The world is not only hungry, it is also thirsty for water. This may seem strange to you, since nearly 75% of the earth’s surface is covered with water. But about 97% of this huge amount is seawater, (76) salt water. Man can only drink and use the other 3% of the fresh water that comes from rivers, lakes, underground, and other (77) And we cannot even use all of that, because some of it is in the form of icebergs and glaciers. Even worse, some of it has been polluted.
However, as things stand today, this small amount of fresh water, (78) is constantly being replaced by rainfall, is still enough for us. But our need (79) water is increasing rapidly—almost day by day. Only if we take steps to deal with this problem now (80) a severe worldwide water shortage later on. A limited water supply would have a bad effect on agriculture and industry. Let me give you just one small example of (81) necessary water is to
A. what 
B. ones 
C. these 
D. those

[单项选择]
The world is not only hungry, but also thirsty for water. This may seem strange to you, since nearly 75 percent of the earth’s surface is covered with water. But about 97 percent of this huge amount is seawater, or salt water. Man can only drink and use the other 3 percent—the fresh water that comes from rivers and lakes. Some of it has been polluted and unfit for drinking.
However, as things stand today, this small amount of flesh water is still enough for us. But our need for water is increasing rapidly almost day by day. Only if we take steps to deal with this problem now, can we avoid (避免) a serious worldwide water shortage later on so we all have to learn how to stop wasting our precious water.
One of the steps we should take is to develop ways of reusing water. Today in most large cities water is used only once and then discharged (使流走). But it is possible to purify (净化) the water so that it can be used again.
But even if every larg
A. Problems of the Modem World.
B. Oceans.
C. The Hungry World.
D. A Thirsty World.

[单项选择]The world is not only hungry, it is also thirsty for water. This may seem strange to you, since nearly 75% of the earth’s surface is covered with water. But about 97% of this huge (巨大的) amount (总计，等于) is seawater, or salt (盐，腌) water. Man can only drink and use the other 3% - the fresh (新的，清新的) water that comes from rivers, lakes, underground, and other sources. And we cannot even use all of that, because some of it is in the form of icebergs and glaciers (冰河). Even worse (更坏的，更差的), some of it has been polluted.
However (然面，不管怎样), as things stand today, this small amount of fresh water, which is constantly being replaced by rainfall (降雨量), is still enough for us. But our need for water is increasing (日益地，愈加地) rapidly -almost day by day. Only if we take steps to deal with this problem now can we avoid (避开，避免) a severe (严重的，激烈的) worldwide (遍及地球的) water shortage (短缺) later (后来，过一会儿) on. A limited (有限的) water supply would have a bad effect (结果，效果) on agriculture and industry (工业，产业).<

[填空题]