单项选择题

The Faraday effect was the first demonstration of a connection between magnetism and light.

A. questioning

B. proof
C. achievement

D. symbol

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单项选择题

Human facial expressions differ from those of animals in the degree to which they can be deliberately controlled and modified.()

A. sufficiently
B. noticeably
C. intentionally
D. absolutely

单项选择题

Launched in the autumn of 1976 in London, and now published ten times a year.()

A. Ended
B. Followed
C. Included
D. Started

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