2. 外语
  3. We could not pull apart two plates which ______ a vacuum, unless we spend great strength.

We could not pull apart two plates which ______ a vacuum, unless we spend great strength.

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问题 We could not pull apart two plates which ______ a vacuum, unless we spend great strength.
选项 A、removed
B、substituted
C、enclosed
D、replaced
答案C
解析 题意是：我们不能把______一层真空的两块平板拉开，除非花很大的力气。 [C]enclosed“围绕，包着”，符合题意。[A]removed“移走，移开”，[B]substituted“替代”， [D]replaced“替代”都与题意不符。
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大学英语四级

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