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） }=8B*  
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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） :
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The second most important constituent of the biosphere is 6^"=dn6
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liquid water. This can only exist in a very narrow range of temperatures, (v}>tb*#`  
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since water freezes at 0°C and boils at 100°C. This is I9mvte  
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only a tiny range compared with the low temperatures of some <p\6AnkMr  
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other planets and the hot interior of the earth, let the temperature __1__ KOp162X>r  
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of the sun. by controlpanel ,XIz?R>;c  
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As we know, life would only be possible on the face of a __2__ 7"w2$*4'0  
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planet had temperatures somewhere within this range. __3__ {FIXc^m'  
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The earth’s supply of water probably remains quite fairly constant __4__ ,Td!|~I|j6  
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in quantity. A certain number of hydrogen atoms, which I{lT>go  
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are one of the main constituents of water, are lost by escaping NyVnA  
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from the atmosphere to out space, but they are probably just __5__ -x'z XvWZ  
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about to be replaced by new water rising away from the depths of the __6__ mN>h5G>a  
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earth during volcanic action. The total quantity of water is not :bWUuXVtJ  
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known, and it is about enough to cover the surface of the globe __7__ BVr0Gk  
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to a depth of about two and three-quarter kms. Most of it—97% <%Ostqj  
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is in the form of the salt waters of the oceans. The rest is \uXcLhXN  
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fresh, but three quarter of this is in the form of ice at the Poles __8__ .h& . K  
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and on mountains, and cannot be used by living systems when __9__ ,daKC  
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melted. Of the remaining fraction, which is somewhat fewer __10__  -W<vyNSr  
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than 1%of the whole, there is 10-20 times as much stored as underground V hk_  
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water as is actually on the surface. There is also a minor,

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