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 off
C、give over
D、give away
答案B
解析 惯用搭配题。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。本句的难点是：give into为非固定搭配；give off意为“散发”；和gas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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