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） Ii!{\p!  

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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]"w0a-`^@  
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The second most important constituent of the biosphere is ~V0 GRPnI  
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liquid water. This can only exist in a very narrow range of temperatures, 'F3@Xh  

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since water freezes at 0°C and boils at 100°C. This is 7a=ul:  
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only a tiny range compared with the low temperatures of some DXQ]b)y+N  
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other planets and the hot interior of the earth, let the temperature __1__ gLg.m V1<  
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of the sun. by controlpanel ia,5=SKJ  
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As we know, life would only be possible on the face of a __2__ %<8r`BMo  
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planet had temperatures somewhere within this range. __3__ e,d}4 jy  
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The earth’s supply of water probably remains quite fairly constant __4__ Z!*6;[]SfG  
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in quantity. A certain number of hydrogen atoms, which iP@FXJJ  
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are one of the main constituents of water, are lost by escaping !yr4B"kz  
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from the atmosphere to out space, but they are probably just __5__ ln K  
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about to be replaced by new water rising away from the depths of the __6__ D!ASO]  
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earth during volcanic action. The total quantity of water is not pjQyN|KS  
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known, and it is about enough to cover the surface of the globe __7__ %3AE 2"  
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to a depth of about two and three-quarter kms. Most of it—97% _1mpsY< k  
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is in the form of the salt waters of the oceans. The rest is !"&-k:|g  
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fresh, but three quarter of this is in the form of ice at the Poles __8__ _l1"X^Aa  
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and on mountains, and cannot be used by living systems when __9__ U_;="y  
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melted. Of the remaining fraction, which is somewhat fewer __10__ !Q5,Zhgr  
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than 1%of the whole, there is 10-20 times as much stored as underground {`e-%<  
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water as is actually on the surface. There is also a minor,

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