Warning: Holding a cell phone against your ear or storing it in your pocket

游客2024-09-22 42

问题 Warning: Holding a cell phone against your ear or storing it in your pocket may be hazardous to your health.
This paraphrases a warning that cell phone manufacturers include in the small print that is often【C1】______ when a new phone is purchased. Apple, 【C2】______, doesn’t want iPhones to come closer to you than 1.5 centimeters; Research In Motion, BlackBerry’s manufacturer,【C3】______2.5 centimeters.
If health issues【C4】______cell phone use, the implications are huge. According to a recent survey,Americans chat【C5】______cell phones 2.26 trillion minutes annually, which【C6】______ $100 billion for the wireless carriers. Epidemiologists(流行病学家)pointed out that brain cancer is a( n) 【C7】______. Overall, there has not been a(n) 【C8】______ in its incidence since cell phones arrived. But the average【C9】______an increase in brain cancer in the 20-to-29 age group【C10】______a drop for the older population.
"Most cancers have【C11】______causes," an expert says,【C12】______she points to laboratory research that suggests low-energy radiation could damage cells that could possibly lead to cancer.
Besides, children are more【C13】______ to radiation than adults, other scientists point out. Radiation that【C14】______only five centimeters into the brain of an adult will reach much deeper into the brains of children because their skulls are thinner and their brains【C15】______ more absorptive fluid.
Henry Lai ,a research professor at the University of Washington,began laboratory radiation studies in 1980 and found that rats【C16】______ radio frequency radiation had【C17】______DNA in their brains.
Ms. Davis recommends【C18】______wired headsets or the phone’s speaker. Children should text【C19】______ call, she said, and pregnant women should keep phones away from the abdomen【C20】______. [br] 【C4】

选项 A、result in
B、arise from
C、derive from
D、account for

答案 B

解析动词短语辨析题。这篇文章主要说明手机使用对健康所造成的影响，因此，此句应该表明因果关系，[B]arise from意为“起因于，由……引起”，符合文意，故选[B]。[A]result in意为“导致，结果是”，表示前因后果，因此放在此处会使句意颠倒，故排除；[C]derive from表示“起源于，从……获得”，强调源头，故排除；[D]account for表示“解释，说明”，也可以引申为“导致”，因果关系倒置，故排除。

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