It is clear that the whole world is passing through a social revolution in which

 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

试题答案

【解析】D. 考查句子结构和名词词义辨析。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。