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） o+^e+ptc  
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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） Uq%|v  
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The second most important constituent of the biosphere is YSZ
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liquid water. This can only exist in a very narrow range of temperatures, FNl^ lj`Y  
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since water freezes at 0°C and boils at 100°C. This is (hY^E(D  
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only a tiny range compared with the low temperatures of some zcEpywNP  
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other planets and the hot interior of the earth, let the temperature __1__ )pey7-P7g5  
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of the sun. by controlpanel 127@ TN"  
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As we know, life would only be possible on the face of a __2__ 6~k qU4l
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planet had temperatures somewhere within this range. __3__ .B$3y#TOb  
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The earth’s supply of water probably remains quite fairly constant __4__ N
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in quantity. A certain number of hydrogen atoms, which Lhgs|*M  
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are one of the main constituents of water, are lost by escaping l?beqw:  
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from the atmosphere to out space, but they are probably just __5__ Qnp.Na[JV  
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about to be replaced by new water rising away from the depths of the __6__ ]"1\z>Hg  
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earth during volcanic action. The total quantity of water is not OoAZ t  
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known, and it is about enough to cover the surface of the globe __7__ h1?.x  
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to a depth of about two and three-quarter kms. Most of it—97% Yf^/YLLS  
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is in the form of the salt waters of the oceans. The rest is %PU{h  
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fresh, but three quarter of this is in the form of ice at the Poles __8__ j: B,K.:  
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and on mountains, and cannot be used by living systems when __9__ |a[ :L  
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melted. Of the remaining fraction, which is somewhat fewer __10__ 'r?Oz
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than 1%of the whole, there is 10-20 times as much stored as underground ,TxZ:f`"  
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water as is actually on the surface. There is also a minor,

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