Cheap coal ________ a lot of smoke．


  1. A.
    gives up
  2. B.
    gives in
  3. C.
    gives away
  4. D.
    gives off
D
give off的意思是send out smoke(vapour, etc)相當(dāng)于“釋放(出)煙、蒸汽”等；give up放棄；give away贈給，泄密；give in屈服，讓步，其后帶有賓語，要用介詞to，故只有答案D符合題意。
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