A. the tars in tobacco smoke are carcinogenic B. diseases of the heart and blood vessels C. a persistent coughing D. human be

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问题 A. the tars in tobacco smoke are carcinogenic
B. diseases of the heart and blood vessels
C. a persistent coughing
D. human beings
E. the chances of a cure
F. prevent the disease from getting=further
Cancer occurs in most species of animals, in many kinds of plants and in ______.

选项

答案D

解析 见第一段,“Cancer occurs in most species of animals and in many kinds of plants,as well as in human beings."
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