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1、专八英语考试阅读理解试题附答案专八英语考试阅读理解试题附答案Often and violates, what the people.以下是我为大家搜寻整 理的专八英语考试阅读理解试题附答案，期望能给大家带来帮忙!更 多精彩内容请准时关注我们应届毕业生考试网！Can electricity cause cancer? In a society that literally runs on electric power, the very idea seems preposterous. But for more than a decade, a growing band of scientist
2、s and journalists has pointed to studies that seem to link exposure to electromagnetic fields with increased risk of leukemia and other malignancies. The implications are unsettling, to say the least, since everyone comes into contact with such fields, which are generated by everything electrical, f
3、rom power lines and antennas to personal computers and micro-wave ovens. Because evidence on the subject is inconclusive and often contradictory, it has been hard to decide whether concern about the health effects of electricity is legitimateor the worst kind of paranoia.Now the alarmists have gaine
4、d some qualified support from the U.S. Environmental Protection Agency. In the executive summary of a new scientific review, released in draft form late last week, the EPA has put forward what amounts to the most serious government warning to date. The agency tentatively concludes that scientific ev
5、idence suggests a casual link between extremely low-frequency electromagnetic fieldsthose having very longwave-lengthsand leukemia, lymphoma and brain cancer, While the report falls short of classifying ELF fields as probable carcinogens, it does identify the common 60-hertz magnetic field as a poss
6、ible, but not proven, cause of cancer in humans. JThe report is no reason to panicor even to lost sleep. If there is a cancer risk, it is a small one. The evidence is still so controversial that the draft stirred a great deal of debate within the Bush Administration, and the EPA released it over str
7、ong objections from the Pentagon and the Whit House. But now no one can deny that the issue must be taken seriously and that much more research is needed.At the heart of the debate is a simple and well-understood physical phenomenon: When an electric current passes through a wire, tit generates an e
8、lectromagnetic field that exerts forces on surrounding objects, For many years, scientists dismissed any suggestion that such forces might be harmful, primarily because they are so extraordinarily weak. The ELF magnetic field generated by a video terminal measures only a few milligauss, or about one
9、-hundredth the strength of the earths own magnetic field, The electric fields surrounding a power line can be as high as 10 kilovolts per meter, but the corresponding field induced in human cells will be only about 1 millivolt per meter. This is far less than the electric fields that the cells thems
10、elves generate.How could such minuscule forces pose a health danger? The consensus used to be that they could not, and for decades scientists concentrated on more powerful kinds of radiation, like X-rays, that pack sufficient wallop to knock electrons out of the molecules that make up the human body
11、. Such ionizing radiations have been clearly linked to increased cancer risks and there are regulations to control emissions.But epidemiological studies, which find statistical associations between sets of data, do not prove cause and effect. Though there is a body of laboratory work showing that ex
12、posure to ELF fields can have biological effects on animal tissues, a mechanism by which those effects could lead to cancerous growths has never been found.The Pentagon is for from persuaded. In a blistering 33-page critique of the EPA report, Air Force scientists charge its authors with having bias
13、ed the entire document toward proving a link. 0ur reviewers are convinced that there is no suggestion that (electromagnetic fields) present in the environment induce or promote cancer, the Air Force concludes. It is astonishing that the EPA would lend its imprimatur on this report.? Then Pentagons c
14、oncern is understandable. There is hardly a unit of the modern military that does not depend on the heavy use of some kind of electronic equipment, from huge ground-based radar towers to the defense systems built into every warship and plane.1. The main idea of this passage is _A. studies on the cau
15、se of cancerB . controversial view-points in the cause of cancerC . the relationship between electricity and cancer._D. different ideas about the effect of electricity on caner.2. The view-point of the EPA is _A. there is casual link between electricity and cancer.8 . electricity really affects canc
16、er._C. controversial._D. low frequency electromagnetic field is a possible cause of cancer3. Why did the Pentagon and Whit House object to the release of the report? Because _A. it may stir a great deal of debate among the Bush Administration.8 . every unit of the modern military has depended on the
17、 heavy use of some kind of electronic equipment._C. the Pentagons concern was understandable._D. they had different arguments.4. It can be inferred from physical phenomenonA . the force of the electromagnetic field is too weak tobe harmful.B . the force of the e1ectromagnetic field is weaker than th
18、e electric field that the cells generate._C. electromagnetic field may affect health.D . only more powerful radiation can knock electron out of human body.5. What do you think ordinary citizens may do after reading the different arguments?_A. They are indifferent. B. They are worried very much._C. T
19、he may exercise prudent avoidance. C. They are shocked.Vocabulary1. preposterous反常的，非常荒谬的，乖戾的2. leukemia 白血病3. malignancy恶性肿瘤4. legitimate合法的、，合理的5. paranoia偏执狂，妄想狂。这里指：无依据的担忧。6. lymphoma 淋巴瘤7. carcinogen 致癌物8. minuscule很小的，很不重要9. consensus 舆论10. wallop乱窜，猛冲，冲击力11. epidemiological 流行病学的12. blistering罗嗦的，胡扯的13. critique评论,批判14. imprimatur出版许可（官方审查后的），批准答案：BCBAD文档内容到此结束，欢迎大家下载、修改、丰富并分享给更多有 需要的人。