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） ] fwZAU  
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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） (9C<K<  
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The second most important constituent of the biosphere is Hd &{d+B  
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liquid water. This can only exist in a very narrow range of temperatures, _}gtcyx  
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since water freezes at 0°C and boils at 100°C. This is G P
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only a tiny range compared with the low temperatures of some ST dNM\+  
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other planets and the hot interior of the earth, let the temperature __1__ se9>.}zZN  
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of the sun. by controlpanel ytAWOt}`  
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As we know, life would only be possible on the face of a __2__ Jn&7C  
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planet had temperatures somewhere within this range. __3__ L{fFC%|l2L  
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The earth’s supply of water probably remains quite fairly constant __4__ g(4b Ba9y  
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in quantity. A certain number of hydrogen atoms, which #UP~iHbt\  
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are one of the main constituents of water, are lost by escaping OFU/gaO~  
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from the atmosphere to out space, but they are probably just __5__ #q\x$  
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about to be replaced by new water rising away from the depths of the __6__ F>hZ{  
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earth during volcanic action. The total quantity of water is not p *w$:L  
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known, and it is about enough to cover the surface of the globe __7__ {R6HG{"IS6  
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to a depth of about two and three-quarter kms. Most of it—97% f. }c7  
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is in the form of the salt waters of the oceans. The rest is 5
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fresh, but three quarter of this is in the form of ice at the Poles __8__ JYb}Zw;  
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and on mountains, and cannot be used by living systems when __9__ /b#l^x:j  
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melted. Of the remaining fraction, which is somewhat fewer __10__ V N{NA+I  

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than 1%of the whole, there is 10-20 times as much stored as underground 5K%SL1N  
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water as is actually on the surface. There is also a minor,

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