Einstein’s Theory of Relativity was so that few people could understand it at that time.
A. controversial
B. religious
C. abstract
D. contradictory
网友回答
A. controversial
B. religious
(答案→)C. abstract
D. contradictory
解析：考查形容词辨析。A有争议的；B虔诚的，宗教的；C抽象的；D矛盾的；句意：爱因斯坦的相对论是如此地抽象以至于在那时很少有人能够理解。根据句意说明C正确。