中石油2011年职称英语11 至20课完形填空练习.doc

通用英语水平考试—03—21 of, by, up, for, that, which, what, whether, and, so, to, because, with, form, from In 1970 alone, Americans smoke 6 billion cigarettes. This is roughly the equivalent of 4,195 cigarettes a year 1 every person in the country of 18 years of age or more. It is estimated 2 51% of American men smoke compared with 34% of American women. Since 1939, numerous scientific studies have been conducted to determine 3 smoking is a health hazard. The trend 4 the evidence has been consistent and indicates that there is a serious health risk. Research teams have conducted studies 5 show, beyond all reasonable doubt, 6 tobacco smoking, particularly cigarette smoking, is associated 7 shortened life expectancy. Cigarette smoking is believed 8 most research workers in this field to be an important factor in the development of cancer of the lungs and cancer of the throat and it is believed to be related 9 cancer of the bladder and the oral cavity. Male cigarette smokers have a higher death rate 10 heart disease than non-smoking males. Female smokers are thought to be less affected 11 they do not breathe in the smoke 12 deeply. The majority of doctors and researchers consider these relationships proved to their satisfaction and say, Give 13 smoking. If you dont smoke dont start! Apart 14 the scientific statistics, it might be helpful to look at 15 smoking tobacco actually does to the human body. Smoke is a mixture of gases, vaporized chemicals, minute particles of ash, 16 other solids. There is also nicotine, 17 is a powerful poison, and black tar. As the smoke is breathed in, all these components 18 deposits on the membranes of the lungs. One point 19 concentration is where the air tube, or bronchus, divides. Most lung cancer begins 20 this point. ( B ) of, for, later, after, how, while, what, which, who, that, as, at, to, about, on, up, out There used t