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

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：词义辨析。A. process过程；进行；方法 B. attention注意力；关心 C. measure措施；方法 D. part部分，角色。句意：很明显整个世界正在经历一场主要角色一定是由科学技术人员扮演的社会革命。故选D。