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） cK(}B_D$  
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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） 56>Zqtp*  
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The second most important constituent of the biosphere is , PJl32  
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liquid water. This can only exist in a very narrow range of temperatures, j+_g37$:  
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since water freezes at 0°C and boils at 100°C. This is )09_CC!a  
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only a tiny range compared with the low temperatures of some ClaYy58v  
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other planets and the hot interior of the earth, let the temperature __1__ >8t(qM-~:  
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of the sun. by controlpanel g\rujxHlH  
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As we know, life would only be possible on the face of a __2__ N%y%)MI8  
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planet had temperatures somewhere within this range. __3__ MMhd-B1O&  
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The earth’s supply of water probably remains quite fairly constant __4__ @{+*ea7M(`  
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in quantity. A certain number of hydrogen atoms, which G`
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are one of the main constituents of water, are lost by escaping q69a-5q  
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from the atmosphere to out space, but they are probably just __5__ i;/qJKr&#  
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about to be replaced by new water rising away from the depths of the __6__ EnwiE  
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earth during volcanic action. The total quantity of water is not b<=K@I.=  
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known, and it is about enough to cover the surface of the globe __7__ 2"BlV*\lS  
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to a depth of about two and three-quarter kms. Most of it—97% Ls|;gewp  
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is in the form of the salt waters of the oceans. The rest is T0tG1/O\  
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fresh, but three quarter of this is in the form of ice at the Poles __8__ 9]AKNQq m  
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and on mountains, and cannot be used by living systems when __9__ 0;k3  
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melted. Of the remaining fraction, which is somewhat fewer __10__ F},JP'\X  
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than 1%of the whole, there is 10-20 times as much stored as underground Y~Jq!  
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water as is actually on the surface. There is also a minor,

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