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MathCAD使用详解_沈守范著.pdf

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MathCAD使用详解_沈守范著.pdf

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文档介绍

文档介绍:北京华夏大地远程教育网络服务有限公司
Bei jing Huaxia Dadi Distance Learning Services Co.,Ltd
全国职称英语考试样题(卫生类)
第一部分阅读理解(75 分)
Passage 1
Until the twentieth century cigarettes were not an important threat (威胁) to public health.
Men used o mainly in the form of cigars (雪茄烟), chewing o, pipe o(烟草), and
snuff (鼻烟). Most women did not use o at all.
The cigarette industry began in the 1870s with the development of the cigarette manufacturing
machines. This made it possible to produce great numbers of cigarettes very quickly, and it reduced
the price.
Today cigarettes smoking is a widespread habit. About forty-three percent of the adult 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. Seventy-five
percent of the male population and forty-six percent of the these men and eleven percent of the
women have stopped smoking. The number of persons who have given up smoking is increasing.
Men as a group smoke more than women. Among both men and women the age group with the highest
proportion (比例) of smokers is the age group 24-44.
e, 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 es are less
likely to smoke cigarettes than men with fewer years of schooling and lower es. On the other
hand if a well-educated man with a high e smokes as 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 es and higher education than among the lower e and lower educational groups.
These more highly educated women tend to smoke more heavily.
Among teenagers ( 少年) the pictures is similar. There are fewer teenager smokers from
upper-e, well-educated families and fewer from families living in far