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
People should abstain from tobacco smoking because ______.

选项

答案A

解析见第三段，科学家们仍无法确切地知道癌症的发病原因。大多数专家认为，经常或长时间的接触致癌物质是诱发癌症的主要原因。这些致癌物质包括：烟草中的焦油、多种其它化学物质和一些种类的辐射。在多数情况下，如果避免或消除已知的致癌物质，便可预防癌症。比如，肺癌中的大多数病例阳所有癌症病例中的近三分之一都是由吸烟引起的。

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