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） ]w.;4`l*  
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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） 8?%-'z.  
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The second most important constituent of the biosphere is #W|'1 OX4  
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liquid water. This can only exist in a very narrow range of temperatures, cZ|\.0-  
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since water freezes at 0°C and boils at 100°C. This is |>#{[wko  
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only a tiny range compared with the low temperatures of some ^pYxKU_O  
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other planets and the hot interior of the earth, let the temperature __1__ w'UVKpG+  
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of the sun. by controlpanel pim!.=vN/U  
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As we know, life would only be possible on the face of a __2__ [DF,^4g  
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planet had temperatures somewhere within this range. __3__ !s&NT @ S  
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The earth’s supply of water probably remains quite fairly constant __4__ N9v1[~ bv_  
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in quantity. A certain number of hydrogen atoms, which LRNh@g4ei  
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are one of the main constituents of water, are lost by escaping IWY;="  
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from the atmosphere to out space, but they are probably just __5__ )s%[T-uKi  
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about to be replaced by new water rising away from the depths of the __6__ Qx+%"YO  
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earth during volcanic action. The total quantity of water is not Yo|,]X>/  
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known, and it is about enough to cover the surface of the globe __7__ xo7Kn+ Kl  
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to a depth of about two and three-quarter kms. Most of it—97% !;KCU^9  
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is in the form of the salt waters of the oceans. The rest is y9>ZwYN  
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fresh, but three quarter of this is in the form of ice at the Poles __8__ -De9_0#R  
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and on mountains, and cannot be used by living systems when __9__ k\NMy#]Zt  
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melted. Of the remaining fraction, which is somewhat fewer __10__ C<m{*C-`a  
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than 1%of the whole, there is 10-20 times as much stored as underground mqSQL}vR  
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water as is actually on the surface. There is also a minor,

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