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） lBS"3s384  
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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） HV8I nodi  
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The second most important constituent of the biosphere is |4Qx =x >  
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liquid water. This can only exist in a very narrow range of temperatures,  e#1.T  
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since water freezes at 0°C and boils at 100°C. This is 6s5yyy=L%~  
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only a tiny range compared with the low temperatures of some -A}zJBcR  
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other planets and the hot interior of the earth, let the temperature __1__ S#mK Pi+3  
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of the sun. by controlpanel RtwUb(wn6  
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As we know, life would only be possible on the face of a __2__ w763zi{  
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planet had temperatures somewhere within this range. __3__ ?~Pv3'%d  
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The earth’s supply of water probably remains quite fairly constant __4__ L:pUvcAc?  
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in quantity. A certain number of hydrogen atoms, which x}|+sS,g  
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are one of the main constituents of water, are lost by escaping T<6G
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from the atmosphere to out space, but they are probably just __5__ I|T7+{
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about to be replaced by new water rising away from the depths of the __6__ Im+7<3Z  
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earth during volcanic action. The total quantity of water is not ceG&,a$\  
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known, and it is about enough to cover the surface of the globe __7__ #Kl}= 1 4  
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to a depth of about two and three-quarter kms. Most of it—97% 'fn$'CeM(  
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is in the form of the salt waters of the oceans. The rest is mX;H((  
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fresh, but three quarter of this is in the form of ice at the Poles __8__ 3+V#[JBJv  
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and on mountains, and cannot be used by living systems when __9__ 0>FE %  
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melted. Of the remaining fraction, which is somewhat fewer __10__ V{ |[oIp  
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than 1%of the whole, there is 10-20 times as much stored as underground `HyF_m>\  
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water as is actually on the surface. There is also a minor,

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