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） Q#,j,h
 
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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） 1]yjhw9g  
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The second most important constituent of the biosphere is G;'=#c ^  
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liquid water. This can only exist in a very narrow range of temperatures, 0Xke2
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since water freezes at 0°C and boils at 100°C. This is r N.<S[  
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only a tiny range compared with the low temperatures of some =VctG>ct|  
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other planets and the hot interior of the earth, let the temperature __1__ :We}l;.jQ  
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of the sun. by controlpanel Z6`oGFq  
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As we know, life would only be possible on the face of a __2__ R24ZjbKL  
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planet had temperatures somewhere within this range. __3__ VgoN=S  
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The earth’s supply of water probably remains quite fairly constant __4__ 5GwXZ;(G  
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in quantity. A certain number of hydrogen atoms, which oI!L2  
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are one of the main constituents of water, are lost by escaping T\Zq/Z\  
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from the atmosphere to out space, but they are probably just __5__ +Yuy%VT  
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about to be replaced by new water rising away from the depths of the __6__ Q]?Lg  
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earth during volcanic action. The total quantity of water is not 1o;*`  
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known, and it is about enough to cover the surface of the globe __7__ E8:4Z$|c  
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to a depth of about two and three-quarter kms. Most of it—97% 49BLJ|:P?  
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is in the form of the salt waters of the oceans. The rest is m^
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fresh, but three quarter of this is in the form of ice at the Poles __8__ dXe. 5XC  
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and on mountains, and cannot be used by living systems when __9__ =uYz4IDB  
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melted. Of the remaining fraction, which is somewhat fewer __10__ +18)e;   
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than 1%of the whole, there is 10-20 times as much stored as underground U2tsHm.O  
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water as is actually on the surface. There is also a minor,

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