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） 1sIy*z  
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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） ex@,F,u>o  
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The second most important constituent of the biosphere is oUKBb&&O  
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liquid water. This can only exist in a very narrow range of temperatures, *x*,I,03  
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since water freezes at 0°C and boils at 100°C. This is `\RX~ $^  
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only a tiny range compared with the low temperatures of some !%Hl#Pv}  
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other planets and the hot interior of the earth, let the temperature __1__ Tjeo*n^  
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of the sun. by controlpanel +LI*!(T|lm  
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As we know, life would only be possible on the face of a __2__ JK:mQ_  
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planet had temperatures somewhere within this range. __3__ 8~[C'+r  
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The earth’s supply of water probably remains quite fairly constant __4__ |U#w?eE=  
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in quantity. A certain number of hydrogen atoms, which eMm~7\ R  
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are one of the main constituents of water, are lost by escaping ?lET4
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from the atmosphere to out space, but they are probably just __5__ ?N!j.E4=  
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about to be replaced by new water rising away from the depths of the __6__ NW4 s'roP  
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earth during volcanic action. The total quantity of water is not DKVt8/vq  
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known, and it is about enough to cover the surface of the globe __7__ I> 8@=V~  
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to a depth of about two and three-quarter kms. Most of it—97% PRk%C0`  
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is in the form of the salt waters of the oceans. The rest is #HnyE+tD  
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fresh, but three quarter of this is in the form of ice at the Poles __8__ w)m0Z4*  
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and on mountains, and cannot be used by living systems when __9__ B]KLn?zt5  
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melted. Of the remaining fraction, which is somewhat fewer __10__ pTX'5   
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than 1%of the whole, there is 10-20 times as much stored as underground K7O?{/  
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water as is actually on the surface. There is also a minor,

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