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） ]D2d=\  
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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） 3_i29ghv  
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The second most important constituent of the biosphere is &t6SI'  
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liquid water. This can only exist in a very narrow range of temperatures, CzDg?wb  
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since water freezes at 0°C and boils at 100°C. This is {e[~1]j3  
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only a tiny range compared with the low temperatures of some tjne[p  
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other planets and the hot interior of the earth, let the temperature __1__ uXG$YDKqC  
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of the sun. by controlpanel 9!Fg1h=  
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As we know, life would only be possible on the face of a __2__ ZNDjk  
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planet had temperatures somewhere within this range. __3__ ~Hb0)M@y7  
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The earth’s supply of water probably remains quite fairly constant __4__ ExOSHKU,e  
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in quantity. A certain number of hydrogen atoms, which 2>^jMl n  
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are one of the main constituents of water, are lost by escaping 0v3
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from the atmosphere to out space, but they are probably just __5__ 0A75)T=lQ  
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about to be replaced by new water rising away from the depths of the __6__ {'+.?g  
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earth during volcanic action. The total quantity of water is not YJZ`Clp?  
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known, and it is about enough to cover the surface of the globe __7__ > H]|R }h  
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to a depth of about two and three-quarter kms. Most of it—97% OlsD  
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is in the form of the salt waters of the oceans. The rest is 9%?a\#C  
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fresh, but three quarter of this is in the form of ice at the Poles __8__ @u-CR8^  
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and on mountains, and cannot be used by living systems when __9__ .JWN\\  
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melted. Of the remaining fraction, which is somewhat fewer __10__ *XG.?%x*|  
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than 1%of the whole, there is 10-20 times as much stored as underground S@WT;Q2Z  
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water as is actually on the surface. There is also a minor,

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