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

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

游客2024-10-08  30
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 (1)______when a new phone is purchased. Apple,(2)______, doesn’t want IPhones to come closer to you than 1. 5 centimeters; Research In Motion, BlackBerry’s manufacturer,(3)______2.5 centimeters.
    If health issues(4)______ cell phone use, the implications are huge. According to a recent survey, Americans chat(5)______ cell phones 2. 26 trillion minutes annually, which(6)______$109 billion for the wireless carriers. Epide-miologists(流行病学家)pointed out that brain cancer isa(n)(7)______. Overall, there has not been a(n)(8)______in its incidence since cell phones arrived. But the average(9)______ an increase in brain cancer in the 20-to-29 age group(10)______a drop for the older population.
    "Most cancers have(11)______ causes," an expert says, (12)______she points to laboratory research that suggests low-energy radiation could damage cells that could possibly lead to cancer.
    Besides, children are more (13)______ to radiation than adults, other scientists point out. Radiation that(14)______ 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(15)______more absorptive fluid.
    Henry Lai, a research professor at the University of Washington, began laboratory radiation studies in 1980 and found that rats(16)______ radio frequency radiation had(17) ______DNA in their brains.
    Ms. Davis recommends(18)______ wired headsets or the phone’s speaker. Children should text (19)______ call, she said, and pregnant women should keep phones away from the abdomen(20)______. [br] (4)
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，因此放在此处句意颠倒；[C]derive from是表示“起源于，从……获得”，强调源头；[D]account for表示“解释，说明”，也可以引申为“导致”，因果关系倒置，因此排除。
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