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） uAyj# #H  
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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） vnz.81OR  
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The second most important constituent of the biosphere is ~U8#Iq1  
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liquid water. This can only exist in a very narrow range of temperatures, iy Od&|.  
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since water freezes at 0°C and boils at 100°C. This is *D<S \6=  
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only a tiny range compared with the low temperatures of some zx(j6  
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other planets and the hot interior of the earth, let the temperature __1__ ,-CDF)~G=3  
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of the sun. by controlpanel LO.4sO  
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As we know, life would only be possible on the face of a __2__ }(E6:h;}~  
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planet had temperatures somewhere within this range. __3__ /N%f78 Z  
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The earth’s supply of water probably remains quite fairly constant __4__ 9b]U&A$  
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in quantity. A certain number of hydrogen atoms, which U_}$QW0'  
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are one of the main constituents of water, are lost by escaping sQJM 4'8f  
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from the atmosphere to out space, but they are probably just __5__ TP{a*ke^5,  
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about to be replaced by new water rising away from the depths of the __6__ IJ4"X#Q/  
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earth during volcanic action. The total quantity of water is not Ysr{1!K  
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known, and it is about enough to cover the surface of the globe __7__ +ypG<VBx%  
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to a depth of about two and three-quarter kms. Most of it—97% ~|uCZ.;o  
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is in the form of the salt waters of the oceans. The rest is p,tB  
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fresh, but three quarter of this is in the form of ice at the Poles __8__ +W;B8^imG  
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and on mountains, and cannot be used by living systems when __9__ )
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melted. Of the remaining fraction, which is somewhat fewer __10__ ;~1r{kXxA"  
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than 1%of the whole, there is 10-20 times as much stored as underground 5z]dA~;*2  
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water as is actually on the surface. There is also a minor,

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