2. 外语
  3. Although too much【C1】______to the sun’s ultraviolet rays can cause skin cancer, sunshine may have a【C2】______effect against some

Although too much【C1】______to the sun’s ultraviolet rays can cause skin cancer, sunshine may have a【C2】______effect against some

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问题     Although too much【C1】______to the sun’s ultraviolet rays can cause skin cancer, sunshine may have a【C2】______effect against some cancers, U.S. scientists said in April. They【C3】______vitamin D, the so-called sunshine vitamin that is also found in fortified milk and【C4】______products, cod liver and some fatty fish, can help to slow down the speed【C5】______which cancer【C6】______divide. "This study found inverse【C7】______between both residential and occupational exposure to sunlight【C8】______mortality from female breast and colon cancers," said Dr. Michael Freedman of the National Cancer【C9】______.
    In research【C10】______in Occupational and Environmental Medicine, Freedman and his team studied【C11】______from breast, ovarian, colon, prostate and skin cancers in 24 U.S. states between 1984 and 1995 to determine the【C12】______of sunlight on the disease.【C13】______surprisingly, they found more deaths form skin cancer in sunnier【C14】______but the number of people who died from the other cancers was lower in the【C15】______areas. Working【C16】______in a sunny climate was also associated with【C17】______breast and colon cancer deaths but not【C18】______the other cancers. Freedman said more research is needed to【C19】______the association between sunlight and【C20】______cancers.
【C2】
选项 A、potential
B、protective
C、insufficient
D、effective
答案B
解析 空格所在句子大意为：但阳光对某些癌症却有一定——作用。各个选项的意思为：potential“潜力”；protective“保护的，防护的”；insufficient“不足的”；effective“有效的”。根据句意和各个选项的意思可知，正确答案是B。
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