第五部分 ：補(bǔ)全短文(第46～50題，每題2分，共10分)
閱讀下面的短文，文章中有S處空白，文章后面有6組文字，請根據(jù)文章的內(nèi)容選擇5組文字，將其分別放回文章原有位置，以恢復(fù)文章原貌。請將答案涂在答題卡相應(yīng)的位置上。
(46)根據(jù)下面材料，回答題。
A Thirsty World
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 sea-water, or salt water. Man can only drink and use the other 3%--the fresh
water that comes from rivers, lakes, underground, and other sources.____46____, because
some of it is in the form of icebergs and glaciers. Even worse, some of it has been polluted.
At the moment, his small amount of fresh water is still enough for us. However, our need
for water is increasing rapidly. Only if we take steps to deal with this problem now, can we
avoid a severe worldwide water shortage later on. One of the useful steps we can take is to
stop unlimited use of water.____47____, however, would have a bad effect on agriculture
and industry.
In addition to stopping wasting our precious water, one more useful step we should take is
to develop ways of reusing it.____48____, but only on a small scale.
Today, in most large cities, water is used only once and it eventually returns to the sea or
runs into underground storage tanks. But it is possible to pipe water that has been used to a
purifying plant. There it can be filtered and treated with chemicals ____49____ .
____50____, we still would not have enough. Where could we turn next? To the oceans!
All we'd have to do to make use of the vast amount of sea-water is--remove the salt. This
salt-removing process is already in use in many parts of the world. So if we take all these
steps, we'll be in no danger of drying up !
第46題__________
A: A limited water supply
B: so that it can be used again just as if it were fresh from a spring
C: It is possible to purify large amounts of sea water
D: But even if every large city purified and reused its water
E: And we cannot even use all of that
F: Experiments have already been done in this field
答案:E
解析:從原文來看，空白處的前面一句說的是“人們只能用占水資源3%的來自于河流、
湖泊、地下以及其他來源的淡水”，空白處后面說的是“
因為它有一些是冰川和冰河的形式。更糟糕的是，還有一些被污染了”。這里的“it”
顯然指的是“fresh water(
淡水)”，所以這個空格內(nèi)應(yīng)該填入的是和淡水有關(guān)的內(nèi)容，所有選項E“
我們不能使用它們的全部”，因為有些淡水以冰川和冰河的形式存在。更糟糕的是，
還有一些淡水資源被污染了，在語義上與原文一致，所以正確答案為E。
(47) 第47題__________
A: A limited water supply
B: so that it can be used again just as if it were fresh from a spring
C: It is possible to purify large amounts of sea water
D: But even if every large city purified and reused its water
E: And we cannot even use all of that
F: Experiments have already been done in this field
答案:A
解析:
從原文來看，空白處的前面一句說的是“有用的一步就是停止無限量地使用水”，
空白處后面的句子說的是“但是，將會對農(nóng)業(yè)和工業(yè)造成不利影響”，
由此可知空白處填入的應(yīng)該是與水的供給相關(guān)的內(nèi)容。所以選項A“有限的水供給”
為正確答案。
(48) 第48題__________
A: A limited water supply
B: so that it can be used again just as if it were fresh from a spring
C: It is possible to purify large amounts of sea water
D: But even if every large city purified and reused its water
E: And we cannot even use all of that
F: Experiments have already been done in this field
答案:F
解析:
從原文來看，空白處的前面一句說的是“除了停止浪費(fèi)我們珍貴的水資源，
我們要采取的重要一步就是發(fā)明重復(fù)利用水的方法”，空白處后面的句子說的是“
但是只是小規(guī)模的”，
所以這個空格內(nèi)填入的內(nèi)容還應(yīng)該與發(fā)明重復(fù)利用水源的方法有關(guān)，所以選項F“
在這個領(lǐng)域內(nèi)開展了很多實驗”為正確答案。
(49) 第49題__________
A: A limited water supply
B: so that it can be used again just as if it were fresh from a spring
C: It is possible to purify large amounts of sea water
D: But even if every large city purified and reused its water
E: And we cannot even use all of that
F: Experiments have already been done in this field
答案:B
解析:
從原文來看，空白處的前面一句說的是“在那里，它被過濾并用化學(xué)成分處理”，
所以空格內(nèi)填入的內(nèi)容還應(yīng)該與水的處理有關(guān)，所以選項B“ 以便它可以被再次使用，
好像它是來自于井底的新水”為正確答案。
(50) 第50題__________
A: A limited water supply
B: so that it can be used again just as if it were fresh from a spring
C: It is possible to purify large amounts of sea water
D: But even if every large city purified and reused its water
E: And we cannot even use all of that
F: Experiments have already been done in this field
答案:D
解析:
從原文來看，空白處的后面一句說的是“我們的水資源仍舊不夠。我們接下來去哪里求助呢?那就是大?！保f明水資源不夠用，所以空白處填入的內(nèi)容應(yīng)該與水資源不夠用相關(guān)，因此選項D“但是即便是每個大城市都凈化和重復(fù)利用水資源”為正確答案。