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___ most of the earth’s surface is covered by water, fresh water is very rare and precious.
A.As B.AlthoughC.If D.Once
B

试题分析:句意:尽管地球的表面覆盖着水,但是淡水还是稀少的和宝贵的。as因为;         although尽管; if 如果; once一旦。根据句意故选B。
点评:本题难度适中。判断从句中用哪个连词,需用记住连词的用法,在句中的作用,连词也是高考的热点,需要考生平时多练习。需要考生会分析句子成分理解句意。
即学即练:___ these terms are not acceptable to you, we may suggest others.
A. As         B. Although    C. If         D. Once
解析:C。句意:如果你对这些条件不合意,我们可提出别的条件。
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