3．B　解析：词义猜测题。根据第三段中的“However, none of them could give a compelling answer as to why this should happen. The only reasonable explanation...”可知，compelling和reasonable意义相近，画线词所在句的句意为：然而，关于为什么竟然会发生这样的事情，没有人能给出一个令人信服的答案。即B项正确。

　　4．D　解析：主旨大意题。本文主要讲述了James Franco被闪电袭击之后奇迹般地恢复了视力和听力的故事，故D项作文章标题最合适。

　　B

　　(2015·郑州质量预测)In 2015, a report from The New England Journal of Medicine showed that increased body weight is related to the death rate for all cancers.This is based on a study involving about 900,000 people, spanning many years.

　　The study, started in 1992 by the American Cancer Society, included men and women from all 50 states.The youngest participants were 30 years old, and the average age was 57.By December 2008, 24% of the participants had died, just a quarter of them from cancers.In analyzing the results, researchers attempted to take account of such potential factors as smoking, drinking alcohol, taking aspirin and a wide variety of other factors that might otherwise affect the results.

　　The results are clear: the more you weigh, the greater your risk of dying of cancer will be (up to 52% higher for men and 62% for women)．In men as well as women, the only cancers that did not have a strong connection with weight were lung cancer and brain cancer.For women, the strongest correlation with weight was uterine cancer (子宫癌), which is 6.5 times higher for women with a BMI (Body Mass Index) of 40 or more.For men, it was liver cancer, which is 4.5 times higher in most obese(肥胖的) men.

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