单项选择题

In the experiment we kept a watchful eye（）the developments and recorded every detail

A. in
B. at
C. for
D. on

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单项选择题

It is the first of several agreements United States hopes to reach as it attempts to reduce, labor costs by $5.8 billion and （）bankruptcy.

A. dispel
B. revert
C. transfer
D. avert

单项选择题

His inability to learn foreign languages was a(n) obstacle to his career（）

A. barrier
B. excess
C. carrier
D. impulse

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