2. 外语
  3. How important is your cell phone? So far, no studies have proven【B1】______ that the radio signals from cell phones cause brain c

How important is your cell phone? So far, no studies have proven【B1】______ that the radio signals from cell phones cause brain c

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问题     How important is your cell phone? So far, no studies have proven【B1】______ that the radio signals from cell phones cause brain cancer or other health problems. But a new study in the United States has some people wondering what to think The scientists found that holding a cell phone to your ear for at least 50 minutes 【B2】______brain cell activity. Even the scientists themselves are not sure about the【B3】______of their findings. Dr. Volkow says she would not be concerned that 50 minutes of cell phone【B4】______would harm anyone, but the research does illustrate the need to study whether or not there are【B5】______ impacts of such behaviors over several years. Her team studied 47 healthy volunteers between January and December of 2009. The volunteers had cell phones placed against both ears while the scientists made【B6】______of their brain activity. The result shows that even though the radio frequencies that are【B7】______ current cell phone technologies are very weak, they are able to activate the human brain to have an effect. Experts say people who are concerned about mobile phones can【B8】______like using a hands-free device. Dr. Giuseppe Esposito is a nuclear medicine【B9】______at Georgetown University Medical Center in Washington. He says after many years of studies, better kinds of research are still needed to【B10】______questions about cell phone safety. These studies would take years.
【B4】
选项
答案exposure
解析 空格后为情态动词would，由此判断，空格处应填入一个名词与cell phone构成名词短语。结合录音可知，答案为exposure，意为“暴露”。
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