2. 外语
  3. The man who never tries anything new is a(n)______on the wheels of progress.

The man who never tries anything new is a(n)______on the wheels of progress.

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问题 The man who never tries anything new is a(n)______on the wheels of progress.
选项 A、obstacle
B、brake
C、break
D、block
答案B
解析 本题空格处是说阻碍发展。B项“brake起抑制作用的因素，约束”符合题意，常与介词on搭配使用。其他三项“obstacle障碍(物)，常与介词to搭配使用；break破裂，停顿；block阻塞”都不正确。
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