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
【C8】
选项
答案O
解析 空格前面是动词was，后面是介词on，通过并列连词and之后的动词received可以断定，空格处所在的句子为拥有两个并列谓语的被动句，因此空格处需要填入动词的过去分词形式，与received构成并列成分。上句中提到第一轮扫描中，设备呈关闭状态，因此，第二轮的扫描中需要将设备开启，空格处应填入表示“开启，打开”等意义的动词，且需要与介词on搭配使用，由此可以确定，动词过去分词switched为本题答案，switched on意为“开启，打开”。空格处需要填入动词的过去分词形式，因此动词原形derive，maintain以及第三人称单数形式contributes，expresses，pro—vides均可以直接排除，另一个过去分词fixed意为“安装，固定”，与此处要表达的意思不符，也可以排除。
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