The world is not hungry，but it’s thirsty.   1  while we say we are short of water.Why？Because about 97% of water on the earth is sea water which we can‘t drink or use for watering plants directly.Man can only drink and use the 3% of water that comes from rivers and lakes.   2  ，because some of it has been polluted.
　　Now more water is needed.The problem is how we can avoid a serious water shortage in the future.  3 Scientists are making study in this field.Today，In most large cities water is used only once and then runs to the sea or rivers.but it can be used again.Even if every large city reused its water，the water will still not be enough. 4 .
　　The sea seems to give us the best answer.There is a lot of water in the sea.All that needs to be get the salt out of the sea water.This will be expensive，but it has already been used in many parts of the world.   6 So you see，if we can find out a way，we’ll be in no danger of drying up.
從方框中所給的選項中選出能填入空白處的最佳選項，補全短文。其中有一項為多余選項。
A．Scientists are trying to find a cheaper way of doing it.
B．It seems strange that nearly 3/4 of the earth is covered with water.
C．What could people do next?
D．We should use all the water directly.
E. First, we should find out ways to reuse it.
F. And we can’t even use all of that.

小題1:B
小題2:F
小題3:E
小題4:C
小題5:A

試題分析：
小題1:上文提到地球想喝水，下文說地球缺水。根據(jù)連接詞while，然而，可知選B，最符合邏輯關(guān)系。好像很奇快，地球的將近3/4覆蓋著水。
小題2:上文提到地球上大部分水不能直接使用，故選F，我們甚至不能全部利用他們。下文解釋這種問題的原因。
小題3:根據(jù)上文The problem is how we can avoid a serious water shortage in the future.我們怎樣才能避免在將來發(fā)生嚴重的水資源短缺問題，結(jié)合下文有些水可以重復利用，可知選E，首先我們應該找出重新利用他的方法。
小題4:結(jié)合上文出現(xiàn)的序數(shù)詞first，以及下文介紹的利用海水，可知選C，可起到承上啟下的作用。
小題5:上文提到了利用海水的方法，但比較代價高，結(jié)合下文如果我們能找到一種方法，可知選項處為假設的前提，故選A。。
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