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

问题补充：

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：

A. process

B. attention

C. measure

(答案→)D. part

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。