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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单项选择题
He was seriously injured in a car accident, which was（）to faulty brakes.

A. attributed
B. contributed
C. blamed
D. applied
单项选择题
The rigor of the winter in Russia was often described by Mogol（）

A. harshness
B. perturbation
C. dismay
D. pessimism
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