A、Income, years of schooling, and job type. B、Income and work environment. C、Education and mood. D、Occupation and influence of f

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问题  
Until the twentieth century cigarettes were not an important threat to public health. Since the cigarette industry began in the 1870s, however, cigarette manufacturing machines have developed rapidly. This mode it possible to produce great numbers of cigarettes very quickly, and it reduced the price.
    Today cigarette smoking is a widespread habit. About forty-three percent of the men and thirty-one percent of the adult women in the United States smoke cigarettes regularly. It is encouraging to note, however, that millions of people have given up the smoking habit.
    Income, education, and occupation all play a part in determining a person’s smoking habits. City people smoke more than people living on farms. Well-educated men with high income are less likely to smoke cigarettes than men with fewer years of schooling and lower income. On the other hand, if a well-educated man with a high income smokes at all, he is likely to smoke more packs of cigarettes per day. The situation is somewhat different for women. There are slightly more smokers among women with higher family income and higher education than among the lower income and lower educational groups. These more highly educated women tend to smoke more heavily.

选项 A、Income, years of schooling, and job type.
B、Income and work environment.
C、Education and mood.
D、Occupation and influence of family members,

答案A

解析 文中指出Income,education,and occupation all play a part in determining a person’s smoking habits.,即收入水平、教育程度和职业种类决定了一个人是否会养成吸烟的习惯。
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