___ 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

試題分析：句意：盡管地球的表面覆蓋著水，但是淡水還是稀少的和寶貴的。as因為；         although盡管； if 如果； once一旦。根據(jù)句意故選B。
點評：本題難度適中。判斷從句中用哪個連詞，需用記住連詞的用法，在句中的作用，連詞也是高考的熱點，需要考生平時多練習。需要考生會分析句子成分理解句意。
即學即練：___ these terms are not acceptable to you, we may suggest others.
A. As         B. Although    C. If         D. Once
解析：C。句意：如果你對這些條件不合意，我們可提出別的條件。
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