问题
选择题
. 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
答案：D
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。