We are now short          fresh water. Something must be done to prevent people       polluting it.
A. of；from     B. for；from        C. of；to
A

試題分析：句意:我們現(xiàn)在缺乏新鮮的水。必須做點什么來防止人們污染它。第一個空是一個固定的短語，be short of 短缺……；第二個空也是一個句型，prevent sb. from doing sth. 意為：阻止某人做某事。故選A。
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