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.

admin2010-05-25  42
问题 If a substance is dissolved in water or heated, it may ______ a gas.
选项 A、give away
B、give in
C、give off
D、give back
答案C
解析 C give off意为“散发出(气味)，发出(光、声音等)”，可与gas，smell，light，heat，sound等连用，故为答案。而A give away意为“泄漏(秘密)，赠送”；B give in意为“认输，投降；交上”；D give back意为“归还，返回，恢复”。
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