2. 外语
  3. His inability to learn foreign languages was a(n) obstacle to his career.

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

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问题 His inability to learn foreign languages was a(n) obstacle to his career.
选项 A、barrier
B、excess
C、carrier
D、impulse
答案A
解析 本题中，obstacle的意思是“障碍，妨害物”。四个选项中，barrier的意思是“障碍”，如：The police put a barrier across the road．(警察设了路障。)excess的意思是“过度，超过”，carrier的意思是“运送者，搬运器”；impulse的意思是“推动，刺激”。只有A符合题意。
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