A、The great number of people engaged in cigarette producing. B、The rapid development of cigarette-making machines. C、The rapid d

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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, [19]the cigarette-manufacturing machine has developed rapidly. This made it possible to produce great numbers of cigarettes very quickly, and [19]it reduced the price.
    Today cigarette smoking is a widespread habit. About forty-three percent of the men and [20]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.
     [21]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 incomes. 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 education groups. [22] These more highly educated women tend to smoke more heavily.
Questions 19 to 22 are based on the passage you have just heard.
19. What reduced the price of cigarettes?
20. What is the percentage of American adult women who smoke regularly?
21. What plays a part in determining a person’s smoking habit?
22. Which of the following is true according to the passage?

选项 A、The great number of people engaged in cigarette producing.
B、The rapid development of cigarette-making machines.
C、The rapid development of cigarette-making factories.
D、The increasing output of tobacco.

答案B

解析
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