单项选择题

I think you can take a (n) ______ course to improve your lecturing skills.

A. intermediate
B. middle
C. medium
D. mid
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单项选择题
He ______ a well-wished but unsuccessful campaign to ease East-West tensions calling for arms reduction and a summit of the nuclear powers.
A. embarked on
B. reckoned on
C. caught on
D. dwelt on
单项选择题
The wings of the birds still ______ after it had been shot down.
A. slapped
B. scratched
C. flapped
D. fluctuated
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