浙江省松阳县2017高考英语一轮阅读理解训练（6）及答案

　　【四川省成都七中2017诊考试A new study has found no evidence that sunscreen, commonly used to reduce the risk of skin cancer, actually increases the risk.

　　Researchers from the University of Iowa based their findings on a review of 18 earlier studies that looked at the association between sunscreen use and melanoma(黑素瘤. They said that they found flaws in studies that had reported associations between sunscreen use and higher risk of melanoma.

　　Most health experts believe that by protecting the skin from the harmful effects of the sun, sunscreen helps prevent skin cancer, which is increasing in incidence(发生率faster than any other cancer in the United States.

　　But questions have been raised about sunscreen and whether it may have the opposite effect, perhaps by allowing people to remain exposed to the sun longer without burning.

　　The researchers said that among the problems with some earlier studies is that they often failed to take into account that those people most at risk for skin cancer—people with fair skin and freckles(雀斑, for example—are more likely to use sunscreen. As a result, it may appear that sunscreen users get cancer more often.

　　The studies, which generally relied on volunteers to recall their sunscreen use, were also unable to prove how well the products had been applied, said the new study.

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