Einstein’s Theory of Relativity was so 【profound
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Einstein’s Theory of Relativity was so 【profound 】that only a few scientists could understand it.
A. deep
B. superior
C. wide
D. narrow
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答案：A
句意：爱因斯坦的相对论是如此的深奥，以至于只有少数科学家能够理解。pro-found意为“深刻的，深奥的”，与deep（深远的，深奥）意思相近。superior意为“较高的，较好的”;wide意为“宽的”;narrow意为“窄的”。