题目

 It is clear that the whole world is passing through a social revolution in which a central _____ must be taken by scientists and technologists.   A. process         B. attention           C. measure          D. part 答案：【解析】D. 考查句子结构和动词词义辨析。句意：显然，整个世界正经历着一场社会革命；科学家和技术人员必定是这场革命地主要参加者。take part in参加，part前置作了先行词。

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