问题补充：
The heavy smoker has decided to smoking, for he knows smoking his health.
A. cut down, is harmful to
B. cut up, does harm to
C. cut off, is harmful for
D. cut down, does harm for
答案：
(答案→)A. cut down, is harmful to
B. cut up, does harm to
C. cut off, is harmful for
D. cut down, does harm for
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