2. 外语
  3. If a substance is dissolved in water or heated, it may ______ a gas.

If a substance is dissolved in water or heated, it may ______ a gas.

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问题 If a substance is dissolved in water or heated, it may ______ a gas.
选项 A、give into
B、give over
C、give off
D、give away
答案C
解析 考查词组辨析。give off意为“散发”，符合题意，为正确答案。give与into不构成固定搭配；give over意为“托付，交托”；give away意为“送掉，分发(奖品等)”。
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