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1、 2022年大学英语六级考试精读荟萃练习题100篇(41)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 scientists and journalists has pointed to studies that seem to link exposure to electromagnetic fields with i
2、ncreased 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, from power lines and antennas to personal computers and micro-wave ovens. Because evidence on the sub
3、ject 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 gained some qualified support from the U.S. Environmental Protection Agency. In the executive summary of
4、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 evidence “suggests a casual link” between extremely low-frequency electromagnetic fieldsthose having v
5、ery 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 possible, but not proven, cause of cancer in humans.”The report is no reason to panicor even to lost
6、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 strong objections from the Pentagon and the Whit House. But now no one can deny that the issue must b
7、e 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 electromagnetic field that exerts forces on surrounding objects, For many years, scientists dismiss
8、ed 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-hundredth the strength of the earths own magnetic field, The electric fields surrounding a power
9、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 themselves generate.How could such minuscule forces pose a health danger? The consensus used to be that
10、 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. Such “ionizing” radiations have been clearly linked to increased cancer risks and there are regu
11、lations 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 exposure to ELF fields can have biological effects on animal tissues, a mechanism by which those e
12、ffects 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 “biased the entire document” toward proving a link. “Our reviewers are convinced that there is no su
13、ggestion 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 concern is understandable. There is hardly a unit of the modern military that does not depen
14、d 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 isA. studies on the cause of cancerB. controversial view-points in the cause of cancerC. the relationship between el
15、ectricity and cancer.D. different ideas about the effect of electricity on caner.2. The view-point of the EPA isA. there is casual link between electricity and cancer.B. electricity really affects cancer.C. controversial.D.low frequency electromagnetic field is a possible cause of cancer3. Why did t
16、he Pentagon and Whit House object to the release of the report? BecauseA. it may stir a great deal of debate among the Bush Administration.B. every unit of the modern military has depended on the heavy use of some kind of electronic equipment.C. the Pentagons concern was understandable.D. they had different argument
