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

A、giveinto
B、giveover
C、giveoff
D、giveaway
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正确答案:

C

答案解析:

「句意」如果一种物质溶解在水里或被加热,它可能释放出一种气体。

「难点」giveinto为非固定搭配;giveover意为“托付,交托”;giveoff意为“散发”;giveaway意为“送掉,分发(奖品)等”。

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