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） (rqc_ZU5  
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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） ]H|O  
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The second most important constituent of the biosphere is "uCO?hv0  
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liquid water. This can only exist in a very narrow range of temperatures, J^<Gi/:*^  
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since water freezes at 0°C and boils at 100°C. This is =LXjq~p  
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only a tiny range compared with the low temperatures of some ')N[)&&Q{  
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other planets and the hot interior of the earth, let the temperature __1__ r{>Q{$Q  
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of the sun. by controlpanel $%B
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As we know, life would only be possible on the face of a __2__ '9{`Czc(Gb  
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planet had temperatures somewhere within this range. __3__ Emy=q5ryl  
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The earth’s supply of water probably remains quite fairly constant __4__ P~ : N  
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in quantity. A certain number of hydrogen atoms, which $
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are one of the main constituents of water, are lost by escaping clG@]<a`_  
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from the atmosphere to out space, but they are probably just __5__ u6nO\.TTtY  
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about to be replaced by new water rising away from the depths of the __6__ '-U&S  
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earth during volcanic action. The total quantity of water is not 2FR+Z3&z  
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known, and it is about enough to cover the surface of the globe __7__ zO`4W!x&  
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to a depth of about two and three-quarter kms. Most of it—97% yky%+@2q  
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is in the form of the salt waters of the oceans. The rest is bwM?DY
 
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fresh, but three quarter of this is in the form of ice at the Poles __8__ ^T:L6:  
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and on mountains, and cannot be used by living systems when __9__ It7R}0Smg  
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melted. Of the remaining fraction, which is somewhat fewer __10__ @@j:z;^|  
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than 1%of the whole, there is 10-20 times as much stored as underground )=#e*1!b  
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water as is actually on the surface. There is also a minor,

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