2008部分英语考博试题--改错

2008部分英语考博试题--改错2008-10-30 00:29四、改错（1分×10=10分） fYzP4  
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2008部分英语考博试题--改错2008-10-30 00:29四、改错（1分×10=10分） C@\5%~tW+  
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The second most important constituent of the biosphere is W'f"kM  
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liquid water. This can only exist in a very narrow range of temperatures, 7&OJ 8B/  
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since water freezes at 0°C and boils at 100°C. This is x,cvAbwS  
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only a tiny range compared with the low temperatures of some g oyQ',+  
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other planets and the hot interior of the earth, let the temperature __1__ ,nCvA%B!  
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of the sun. by controlpanel u<N` ;s  
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As we know, life would only be possible on the face of a __2__ S-ZN}N{,6  
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planet had temperatures somewhere within this range. __3__ }<@-=  
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The earth’s supply of water probably remains quite fairly constant __4__ GA/afc,V  
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in quantity. A certain number of hydrogen atoms, which N
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are one of the main constituents of water, are lost by escaping 98O]tL+k/u  
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from the atmosphere to out space, but they are probably just __5__ /V`SJ"  
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about to be replaced by new water rising away from the depths of the __6__ X%&7-P
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earth during volcanic action. The total quantity of water is not
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known, and it is about enough to cover the surface of the globe __7__ C& XPn;f  
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to a depth of about two and three-quarter kms. Most of it—97% )!cucY  
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is in the form of the salt waters of the oceans. The rest is n}e%c B  
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fresh, but three quarter of this is in the form of ice at the Poles __8__ 0vX6n6G}  
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and on mountains, and cannot be used by living systems when __9__ :t9![y[=
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melted. Of the remaining fraction, which is somewhat fewer __10__ &"gX 7cK8  
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than 1%of the whole, there is 10-20 times as much stored as underground /wJ4hHY  
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water as is actually on the surface. There is also a minor,

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