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【单选题】
1 It's been 40 years since the surgeon general issued the first report warning that cigarettes cause cancer. Since then, the public has grown acutely aware that smoking is lethal. But though the public education campaign has been a great success in providing information, it's been a failure in one conspicuous way: 46 million American adults still smoke. 2 How come? Because it's so hard to quit. Nicotine is so powerfully addictive that lots of people find it impossible to give up--even with lung cancer, emphysema and heart disease staring them in the face. Despite an array of products and strategies designed to help people conquer the habit, cigarettes remain a major killer in this country. 3 If we want to know how to reduce the death toll from tobacco use, we might want to look at Sweden, where smoking among men has dropped sharply in recent years. How come? Brad Rodu, a professor of pathology at the University of Alabama at Birmingham, says one big reason is that a lot of Swedish smokers have switched to smokeless tobacco. 4 That may sound like a pointless exercise, substituting one deadly addiction for another. In fact, snuff and other unsmoked forms of tobacco are not nearly as risky as the kind you ignite and inhale. 5 A 2002 report by Britain's Royal College of Physicians noted that 'the consumption of non-combustible tobacco is of the order of 10 to 1,000 times less hazardous than smoking.' Smokeless tobacco is known to cause oral cancer. But Rodu estimates that if everyone now smoking made the change, the annual number of tobacco related deaths in the United States would plunge from 440,000 to 6,000. 6 U.S. Surgeon General Richard Carmona, who says he would like to ban all tobacco products, insists that 'there is no scientific evidence that smokeless tobacco products are both safe and effective aids to quitting smoking.' Anti-smoking groups portray smokeless tobacco as an intolerable danger. But a growing pile of evidence suggests snuff could be a valuable tool to help smokers help themselves. 7 It's true that they'd do well to swear off the weed in any form. But when virtue fails, as it often does, we have to look for ways to make vice less dangerous. That's the rationale for giving teens access to condoms and other types of birth control, even if we strongly prefer that they abstain from sex. It's also the idea behind needle-exchange programs, which recognize that one thing worse than injecting heroin is injecting it with an AIDS-infected syringe. 8 Smokeless tobacco offers hope to hard-core smokers because it lets them fill their nicotine needs without sucking toxic fumes into their lungs. Addicts would be better off getting their daily dose without lighting up. 9 The rest of us would gain as well, since this indulgence lacks a notable byproduct of cigarettes: secondhand smoke. (With some forms, the user doesn't even have to spit. ) And nobody ever burned down his house by falling asleep while dipping snuff. 10 You may wonder why any smoker wouldn't use nicotine gum or patches instead. Answer: because they're more expensive and less potent, relieving smokers of their cash but not their cravings. While nicotine maintenance works for some people, it doesn't work for others, and they shouldn't be deprived of additional options. 11 Critics dismiss Rodu as a hired gun for the smokeless tobacco industry, which in recent years has donated money to support his research and would like to market its product as a safer alternative to smoking. But he says his studies between 1993 and 1999 were done without any industry financing. The funds the industry has given since then have been unrestricted grants to the University of Alabama at Birmingham, and it has no control over the research. 1
A.
Quite a big percentage of Americans are cigarette smokers.
B.
Americans are well informed of the danger from smoking.
C.
Smokers of cigarettes may die of cancer.
D.
The campaign against smoking succeeds in preventing Americans from smoking.
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【单选题】The national day of Canada is______as a commemoration of the passage of the British North American Act in 186
A.
July 1
B.
July 4
C.
August 1
D.
August 4
【单选题】The birthday of the ______ is sometimes served as the National Day of Britain.
A.
head of the House of Commons
B.
British Monarch
C.
Prime Minister
D.
Lord Chancellor
【判断题】大型养路机械转向架采用的是滑动轴承箱装置。
A.
正确
B.
错误
【判断题】转8A滚型转向架采用的轴承型号为197730。
A.
正确
B.
错误
【单选题】转8A型转向架或其他载重60t的货车转向架采用的滚动轴承车轴为()。
A.
RB2
B.
C
C.
RD2
D.
RE2
【单选题】为了保证较高的回转精度,M1432A磨床砂轮架中的主轴轴承通常采用(    )。
A.
向心球轴承  
B.
圆锥滚子轴承  
C.
圆柱滚子轴承    
D.
滑动轴承
【单选题】转8AB、转8B型转向架在轴承方面的改造内容是:不得采用()轴承。
A.
SKF
B.
352226X2-2RZ
C.
塑钢保持架
D.
钢保持架
【单选题】多发于10岁以下儿童的是()
A.
髋部扭挫伤
B.
髋关节暂时性滑膜炎
C.
扳机指
D.
颈椎病
E.
网球肘
【多选题】我国人民民主专政与人民代表大会制度的相互关系是
A.
人民民主专政是国体,人民代表大会制度是政体
B.
人民民主专政是国家性质、人民代表大会制度是政治制度
C.
人民民主专政是人民代表大会制度的依据和前提
D.
人民代表大会制度体现人民民主专政的性质和要求
【单选题】关于儿童多动综合症,以下说法不正确的是( )。
A.
儿童多动症的高峰发病年龄8—10岁
B.
儿童多动症中男性儿童的患病率明显高于女性
C.
多动症儿童即轻度脑功能障碍儿童
D.
多动症可能是先天体质上的原因,也可能是不安环境引起精神高度紧张的结果
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