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
In the United States and Canada, cancer ranks as the most fatal disease next to ______.

选项

答案B

解析 见第一段“The disease is a leading cause of death in many countries. In the United States and Canada,only diseases of the heart and blood uessels kill more people.”在许多国家癌症是头号杀手,在美国和加拿大,只有心脏和血管疾病导致更多人的死亡。说明癌症在美国和加拿大是仅次于心血管疾病的杀手。
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