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

Because he is（）, we cannot predict what course he will follow at any moment.

A. incoherent
B. quiet
C. capricious
D. harmful

单项选择题

Henry David Thoreau used to ramble through the woods before he wrote his most famous book Walden (1854)（）

A. roam
B. linger
C. wonder
D. browse

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