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） (\T8!s{AO  
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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） .i1jFwOd|G  
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The second most important constituent of the biosphere is K-N]h  
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liquid water. This can only exist in a very narrow range of temperatures, f6keWqv<GW  
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since water freezes at 0°C and boils at 100°C. This is 53g8T+`\(  
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only a tiny range compared with the low temperatures of some "`gfy  
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other planets and the hot interior of the earth, let the temperature __1__ <Tj"GVZAEO  
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of the sun. by controlpanel D#vn {^c8O  
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As we know, life would only be possible on the face of a __2__ V0SW 5 m  
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planet had temperatures somewhere within this range. __3__ N}.Q%&6:  
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The earth’s supply of water probably remains quite fairly constant __4__ F^%{ ;  
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in quantity. A certain number of hydrogen atoms, which nN_94 ZqS<  
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are one of the main constituents of water, are lost by escaping dy8In%  
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from the atmosphere to out space, but they are probably just __5__ )<]w23i  
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about to be replaced by new water rising away from the depths of the __6__ M&}oat*  
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earth during volcanic action. The total quantity of water is not ^J#*n;OQ3A  
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known, and it is about enough to cover the surface of the globe __7__ |)!k@?_  
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to a depth of about two and three-quarter kms. Most of it—97% H8o% H=I%  
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is in the form of the salt waters of the oceans. The rest is cciAMQhA  
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fresh, but three quarter of this is in the form of ice at the Poles __8__ _]?Dt%MkD  
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and on mountains, and cannot be used by living systems when __9__ tmY-m,U  
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melted. Of the remaining fraction, which is somewhat fewer __10__ 0i mqj7L  
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than 1%of the whole, there is 10-20 times as much stored as underground =Zb"T5E  
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water as is actually on the surface. There is also a minor,

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