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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）
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The second most important constituent of the biosphere is ZLT?G
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liquid water. This can only exist in a very narrow range of temperatures, E:x@O8F
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since water freezes at 0°C and boils at 100°C. This is YCD |lL#
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only a tiny range compared with the low temperatures of some Vc(4d-d5
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other planets and the hot interior of the earth, let the temperature __1__ o9 9ExQ.
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of the sun. by controlpanel $Q/@5f'T`9
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As we know, life would only be possible on the face of a __2__ YGo?%.X
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planet had temperatures somewhere within this range. __3__ r%.k,FzGZY
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The earth’s supply of water probably remains quite fairly constant __4__ .G[/4h :.
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in quantity. A certain number of hydrogen atoms, which ,W}:vd C
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are one of the main constituents of water, are lost by escaping INN} xZ
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from the atmosphere to out space, but they are probably just __5__ l
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about to be replaced by new water rising away from the depths of the __6__ l(Rn =?
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earth during volcanic action. The total quantity of water is not :0r ,.)
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known, and it is about enough to cover the surface of the globe __7__ g$K\rA
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to a depth of about two and three-quarter kms. Most of it—97% H>C bMz1u
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is in the form of the salt waters of the oceans. The rest is u_k[< & $
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fresh, but three quarter of this is in the form of ice at the Poles __8__ [|Qzx w9
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and on mountains, and cannot be used by living systems when __9__ QF>T)1&J[7
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melted. Of the remaining fraction, which is somewhat fewer __10__ l!tR<$|
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than 1%of the whole, there is 10-20 times as much stored as underground jri"# H
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water as is actually on the surface. There is also a minor,
