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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