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.

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

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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 phone【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
【C6】
选项
答案J
解析 空格前面为to，后面为介词in，而且与to搭配的是动词asked，构成ask sb．to do sth．结构，意为“要求某人做某事，让某人做某事”，因此空格处需要填入动词。本句的意思是在一项新的研究中，研究专家找到了47名志愿者参与到一项实验项目中，通过扫描大脑进而对细胞如何消耗能量进行观察，以测定大脑中葡萄糖的消耗情况，因此空格处应填入一个表示“参与，参加”的动词，而且需要与介词in进行搭配，由此确定动词participate为本题答案，意为“参加”。此处需要填入的是动词原形，因此第三人称单数的动词contributes，expresses，provides，以及过去分词fixed，switched可以直接排除，derive“剥夺”和maintain“坚持认为”均不符合题意，也可以排除。
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