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） 6.UKB<sV  
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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） k)Zn>  
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The second most important constituent of the biosphere is LAos0bc)w\  
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liquid water. This can only exist in a very narrow range of temperatures, b<8q 92F  
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since water freezes at 0°C and boils at 100°C. This is !&\meS{  
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only a tiny range compared with the low temperatures of some `{%-*f^  
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other planets and the hot interior of the earth, let the temperature __1__ a&8l[xe1  
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of the sun. by controlpanel QT7_x`#J~o  
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As we know, life would only be possible on the face of a __2__ nQ!N}5[z'  
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planet had temperatures somewhere within this range. __3__ 7Onk!NH  
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The earth’s supply of water probably remains quite fairly constant __4__ X1O65DMr`g  
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in quantity. A certain number of hydrogen atoms, which QXsfp  
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are one of the main constituents of water, are lost by escaping i_|h{JK)  
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from the atmosphere to out space, but they are probably just __5__ ;g&7*1E  
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about to be replaced by new water rising away from the depths of the __6__ is64)2F](  
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earth during volcanic action. The total quantity of water is not q$bHO  
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known, and it is about enough to cover the surface of the globe __7__ aeLBaS  
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to a depth of about two and three-quarter kms. Most of it—97% 6-D%)Z(  
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is in the form of the salt waters of the oceans. The rest is 6wa<'!  
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fresh, but three quarter of this is in the form of ice at the Poles __8__ Rc$=+K#  
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and on mountains, and cannot be used by living systems when __9__ r!"CH5dT  
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melted. Of the remaining fraction, which is somewhat fewer __10__ #-l!`\@  
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than 1%of the whole, there is 10-20 times as much stored as underground JrY"J]/  
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water as is actually on the surface. There is also a minor,

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