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 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 biased the entire document toward proving a link. Our reviewers are convinced that there is no suggestion that 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 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 cause of cancer

　　[B]. controversial view-points in the cause of cancer

　　[C]. 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.

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