A new study has found no evidence that sunscreen, commonly used to reduce the ri

A newstudy has found no evidence that sunscreen, commonly used to reduce the risk ofskin caner, actually increases the risk.

Researchersfrom the University of Yale based their findings on a review of 18 earlierstudies that looked at the association between sunscreen use and melanomas (黑素瘤). They said that they found flawsin studies that had reported associations between sunscreen use and higher riskof melanoma.

Mosthealth experts believe that by protecting the skin from the harmful effects ofthe sun, sunscreen helps prevent skin cancer, which is increasing in incidence(发生率) faster than anyother cancer in the United States.

Butquestions have been raised about sunscreen and whether it may have the oppositeeffect, perhaps by allowing people to remain exposed to the sun longer withoutburning.

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

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

1.Theunderlined word “flaws” in the 2^nd paragraph most probably means           .

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

2.Peoplewith fair skin and freckles           .

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

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

3.We canlearn 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

4.Which ofthe following can be the best 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

试题答案

【答案】

1.C

2.B

3.D

4.A

【解析】略