Question

A new study has found no evidence that sunscreen, commonly used to reduce the risk of skin caner, actually increases the risk.

Researchers from the University of lows based their firdings on a review of 18 earlier studies that looked at the associstion between sunscreen use and melanoms(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 helpsprevent 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 concer―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.

72.   The underlined word “flaws” in the 2^nd paragraph most probably means           .

       A.evidences           B.facts           C.faults          D.failures

73.   People with fair skin and freckles           .

       A.seldom use sunscreen                             B. are more in danger of skin concer

       C. can be free from the harm of the sun             D. often expose themselves to the sun

74.   We can learn from the passage that          .

       A. sunscreen users get skin cancer more often

       B. the volunteers have proved the effect of sunscreen

       C. the new study was based on the experiences of volunteers

       D. the number of skin cancer patients is increasing in America

75.   Which of the following can be the beat title for this passage?

       A. Sunscreen to Prevent Skin Cancer                 B. Sunscreen to Increase Skin Cancer

       C. Skin Cancer Caused by Sunscreen                 D. Skin Cancer Caused by Freckles

Answer 1

72.C.细节理解题。文章第一段就开门见山指出：到目前为止还没证据表明sunscreen会增加skin cancer的几率，接下来的段落也解释了使用sunscreen跟skin cancer没有必然的联系，故排除A、B选项。

73.B.细节理解题。根据第五段中的…that those people most at risk for skin cancer--- people with fair skin and freckles (雀斑),…可以找到正确答案。

74.D.细节理解题。根据第三段中的…,which is increasing in incidence (发生率) faster than any other cancer in the United States.可以获取正确信息。

75.A.主旨概括题。读完全文可知：sunscreen有助于防癌。