考博英语改错模拟练习题及答案解析（64）
考博英语考试中有些院校的考博题型中有改错这项，考博英语改错题型需要同学们运用语法、修辞、结构等知识识别短文内的语病并作出改正，很考验考生的语法能力，新东方在线考博频道整理了考博英语改错模拟练习题及答案解析系列文章供考生们参考练习。
The second most important constituent of the biosphere is liquid water. This can only exist in a very narrow range of temperatures,since water freezes at 0°C and boils at 100°C. This is only a tiny range compared with the low temperatures of some other planets and the hot interior of the earth, let the temperature __1__
of the sun.
As we know, life would only be possible on the face of a __2__planet had temperatures somewhere within this range. __3__The earth’s supply of water probably remains quite fairly constant __4__in quantity. A certain number of hydrogen atoms, which are one of the main constituents of water, are lost by escaping from the atmosphere to out space, but they are probably just __5__
about to be replaced by new water rising away from the depths of the __6__
earth during volcanic action. The total quantity of water is not known, and it is about enough to cover the surface of the globe __7__to a depth of about two and three-quarter kms. Most of it—97%is in the form of the salt waters of the oceans. The rest is fresh, but three quarter of this is in the form of ice at the Poles __8__
and on mountains, and cannot be used by living systems when __9__melted. Of the remaining fraction, which is somewhat fewer __10__than 1%of the whole, there is 10-20 times as much stored as underground water as is actually on the surface. There is also a minor,but extremely important, fraction of the water supply
which is present as water vapour in the atmosphere.
答案：
1.Let ^the 加入alone. Let alone 意为“更不用说”， 表示一种让步关系。
2.face-surface 根据上下文理解，应该指地球的表面。
3.planet^had 加入which或that。这样使得planet后面的句子成为一个定语从句。
4.去掉fairly或quite 意思重复。
5.out改成outer 这里指外层空间。
6.去掉away rise后面不接away。
7.and改成although 短文中这里是让步关系，而不是并列关系。
8.quarter改成quarters 英语表达中，当分子是二以上的数时，分母应为复数。
9.when改成until或者unless 根据上下文，这句话的意思应为:除非(冰雪)融化，否则(地球上的)生命系统就无法利用水。所以when在这里的意思有误。
10.fewer改成less 文中的remaining fraction 仍指水，因此不能用fewer，要用less。