2008部分英语考博试题--改错2008-10-30 00:29四、改错（1分×10=10分） y@I 9>}"y
7,p.M) t)
iT Aj$ { >
2008部分英语考博试题--改错2008-10-30 00:29四、改错（1分×10=10分） _d3Z~cH
[>a3` 0M
b5=|1SjR
The second most important constituent of the biosphere is [T =>QS@g
E-C]<{`O
liquid water. This can only exist in a very narrow range of temperatures, 81y<Uz 6
NO[A00m|OL
since water freezes at 0°C and boils at 100°C. This is iE"]S )
&nr{-][
only a tiny range compared with the low temperatures of some &Hp*A ^M
& tT6.@kH
other planets and the hot interior of the earth, let the temperature __1__ hO$Gx*e$
WM|G/'q
of the sun. by controlpanel
>Z_;ZMu)
,
p}:?uR
As we know, life would only be possible on the face of a __2__ p1d%&e
}hg=#*
planet had temperatures somewhere within this range. __3__ Q<AOc\ oO
MF'Z?M
The earth’s supply of water probably remains quite fairly constant __4__ #N`G2}1J
!J;Bm,Xn6
in quantity. A certain number of hydrogen atoms, which <bhGpLh-E
d'MZ%.#
are one of the main constituents of water, are lost by escaping bR"4:b>K
+8Q @R)3
from the atmosphere to out space, but they are probably just __5__ Q`8-|(ngw
${z #{c1
about to be replaced by new water rising away from the depths of the __6__ V1M|p!
*GXPN0^Qjo
earth during volcanic action. The total quantity of water is not !Ltx2CB2]
AcnY6:3Y|
known, and it is about enough to cover the surface of the globe __7__ SP lt=*C#_
:l]qTCmY
to a depth of about two and three-quarter kms. Most of it—97% $S<B\\
%
h@O\j& #
is in the form of the salt waters of the oceans. The rest is {jYVA~.|Z
g$e|y#Ic$
fresh, but three quarter of this is in the form of ice at the Poles __8__ jG &HPVr
]'%
iR
and on mountains, and cannot be used by living systems when __9__ WxYEu +_
(=u!E+N
melted. Of the remaining fraction, which is somewhat fewer __10__ >%`SXB& 9
y7h^_D+Ce
than 1%of the whole, there is 10-20 times as much stored as underground (|AZO!
u8JH~b
water as is actually on the surface. There is also a minor,
