Only people can have a good understanding of the lecture given by the scientist.
A. educated
B. devoted
C. concerned
D. relaxed
网友回答
(答案→)A. educated
B. devoted
C. concerned
D. relaxed
解析：句意：只有受过教育的人才能够很好的理解这位科学家的演讲。Educated受过教育的；devoted献身的；concerned担心的；relaxed轻松的，选A。