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） +gyGA/5:d$  
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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） ;lQ>>[*  
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The second most important constituent of the biosphere is 7fC:'1]G  
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liquid water. This can only exist in a very narrow range of temperatures, Mt*V-`+\  
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since water freezes at 0°C and boils at 100°C. This is ,FwJ0V  
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only a tiny range compared with the low temperatures of some  (F&o!W  
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other planets and the hot interior of the earth, let the temperature __1__ :W9a t  
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of the sun. by controlpanel 0$_WIk  
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As we know, life would only be possible on the face of a __2__ E"7[|-`e6  
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planet had temperatures somewhere within this range. __3__ F#~*j  
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The earth’s supply of water probably remains quite fairly constant __4__ ;?y~ h$  
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in quantity. A certain number of hydrogen atoms, which \z euvD  
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are one of the main constituents of water, are lost by escaping B h&dV%'  
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from the atmosphere to out space, but they are probably just __5__ RIDl4c [  
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about to be replaced by new water rising away from the depths of the __6__ ltKMvGEF  
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earth during volcanic action. The total quantity of water is not ZSr!L@S  
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known, and it is about enough to cover the surface of the globe __7__ |D_4 iFC  
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to a depth of about two and three-quarter kms. Most of it—97% 3#Iq5vT  
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is in the form of the salt waters of the oceans. The rest is u\"/EaQ{  
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fresh, but three quarter of this is in the form of ice at the Poles __8__ o' v!83$L  
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and on mountains, and cannot be used by living systems when __9__ )[u'LgVN/L  
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melted. Of the remaining fraction, which is somewhat fewer __10__ ;rNX  
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than 1%of the whole, there is 10-20 times as much stored as underground }0f~hL24  
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water as is actually on the surface. There is also a minor,

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