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） Ki&WS<,0Z  
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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） nph7&[xQI  
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The second most important constituent of the biosphere is Cw9@2E'b  
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liquid water. This can only exist in a very narrow range of temperatures, "W3n BaG  
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since water freezes at 0°C and boils at 100°C. This is wz|Q%.%?[  
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only a tiny range compared with the low temperatures of some p4<M|1Z&  
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other planets and the hot interior of the earth, let the temperature __1__ WsK"^"Z  
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of the sun. by controlpanel Q T0IW(A  
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As we know, life would only be possible on the face of a __2__ *h5ldP  
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planet had temperatures somewhere within this range. __3__ v3VLvh2)n  
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The earth’s supply of water probably remains quite fairly constant __4__ Sx4UaV~"  
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in quantity. A certain number of hydrogen atoms, which I1}{~@  
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are one of the main constituents of water, are lost by escaping cr=FMfhB  
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from the atmosphere to out space, but they are probably just __5__ `hQ!*f6  
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about to be replaced by new water rising away from the depths of the __6__ (VF4FC  
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earth during volcanic action. The total quantity of water is not fSQ3 :o  
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known, and it is about enough to cover the surface of the globe __7__ s+\qie  

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to a depth of about two and three-quarter kms. Most of it—97% ;^H+ |&$>  
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is in the form of the salt waters of the oceans. The rest is GXvo't@N  
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fresh, but three quarter of this is in the form of ice at the Poles __8__ DoPF/m}  
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and on mountains, and cannot be used by living systems when __9__ 1 069]  
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melted. Of the remaining fraction, which is somewhat fewer __10__ k`J..f9  
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than 1%of the whole, there is 10-20 times as much stored as underground X-) ]lAP  
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water as is actually on the surface. There is also a minor,

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