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） mN'
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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） ,-1d2y  
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The second most important constituent of the biosphere is o X?~  
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liquid water. This can only exist in a very narrow range of temperatures, J|e3 UikA  
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since water freezes at 0°C and boils at 100°C. This is )9kp[hY  
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only a tiny range compared with the low temperatures of some ]O&yy{yYK  
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other planets and the hot interior of the earth, let the temperature __1__ u\=yY.   
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of the sun. by controlpanel p ?x]|`M  
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As we know, life would only be possible on the face of a __2__ O,0j +1?  
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planet had temperatures somewhere within this range. __3__ ?cgb3^R'  
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The earth’s supply of water probably remains quite fairly constant __4__ )D ':bWP  
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in quantity. A certain number of hydrogen atoms, which # 0/,teJk  
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are one of the main constituents of water, are lost by escaping W! GUA<  
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from the atmosphere to out space, but they are probably just __5__ [ejl #'*5  
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about to be replaced by new water rising away from the depths of the __6__ XF9
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earth during volcanic action. The total quantity of water is not L7s _3\  
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known, and it is about enough to cover the surface of the globe __7__ >;k~B  
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to a depth of about two and three-quarter kms. Most of it—97% ':|?M B  
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is in the form of the salt waters of the oceans. The rest is G/V0Yn""  
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fresh, but three quarter of this is in the form of ice at the Poles __8__ -d6PXf5  
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and on mountains, and cannot be used by living systems when __9__ {)& b6}2h  
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melted. Of the remaining fraction, which is somewhat fewer __10__ (t"rzH  
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than 1%of the whole, there is 10-20 times as much stored as underground )|<g\>/  
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water as is actually on the surface. There is also a minor,

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