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
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D解析 本题译文: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。