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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  10
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] (12)
选项 A、or
B、but
C、and
D、otherwise
答案 B
解析 语篇衔接题。[B]but符合此处的逻辑关系，故为正确答案。[A]or表示选择，与此处的逻辑关系相悖，排除；[C]and表示承接；[D]otherwise表示“否则，要不然”，上述两项均与原文不符，排除。
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