2. 外语
  3. So many people use the cell phone so frequently every day. But【C1】______little is certain about the health effects of its use. M

So many people use the cell phone so frequently every day. But【C1】______little is certain about the health effects of its use. M

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问题     So many people use the cell phone so frequently every day. But【C1】______little is certain about the health effects of its use. Manufacturers【C2】______that cell phones meet government standards for safe radio frequency radiation emission, but enough studies are beginning to document a possible【C3】______in rare brain tumors(肿瘤), headaches and behavioral disorders in children to cause concern. So far, the evidence isn’ t【C4】______on whether the use of cell phones【C5】______to any increased risk of cancer. In a new trial, researchers asked 47 volunteers to【C6】______in a project to measure glucose(葡萄糖)consumption in the brain by scanning the brain to see how cells use energy. For both 50 minute scans, the volunteers had a cell phone【C7】______to each ear. During the first scan, the devices were turned off but for the second scan, the phone on the right ear was【C8】______on and received a recorded message call, although the volume was muted(消音)so the noise wouldn’ t bias the results. The results of the second scan showed that the【C9】______of the brain nearest to the device had higher rates of glucose consumption than the rest of the brain. The study shows that cell phones can change brain activity, and【C10】______a whole new avenue for scientific inquiry, though it doesn’ t say anything about whether cell phone radiation can cause cancer.
[A]conclusive[B]contributes
[C]derive[D]expresses
[E]fixed[F]immensely
[G]increase[H]maintain
[I]mission[J]participate
[K]particular[L]provides
[M]regions[N]surprisingly
[O]switched
【C10】
选项
答案L
解析 空格前面为连词and，后面为名词短语，通过对句子结构的分析，空格处缺少的成分是与shows构成并列谓语的动词。文章结尾处对实验结果进行总结，这项研究既证实了手机能够改变大脑的活动，也为进一步的科学研究提供了一个全新的思路。因此，空格处应填入表示“提供”的动词，并且需要与后面的介词for进行搭配，由此可以断定provides为本题答案，provides…for．．．意为“为…提供…”。根据句子的主语和时态，空格处需要填入的是动词第三人称单数形式，因此动词原形derive，maintain，participate以及过去分词fixed，switched可以直接排除，contributes“促成，造成”和expresses“表达”均不符合句意，也可以排除。
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