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
【C7】
选项
答案E
解析 通过分析句子，空格处与前面的动词had构成have sth．done的结构，因此空格处需要填入一个动词的过去分词。根据句意，志愿者们每只耳朵上各被安装一部手机。因此，空格处应填入表示“安装，固定”等意思的动词，并与空格后的介词to进行搭配，由此可以确定动词fixed为本题答案，意为“使固定，安装”。空格处需要填入动词过去分词形式，因此动词原形derive，maintain以及第三人称单数形式contributes，expresses，provides均可以直接排除，另一个过去分词switched意为“转换；改变”，与此处要表达的意思不符，也可以排除。
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