2. 外语
  3. So many people use the cell phone so frequently every day. But【S1】______little is certain about the health effects of its use. M

So many people use the cell phone so frequently every day. But【S1】______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【S1】______little is certain about the health effects of its use. Manufacturers【S2】______that cell phones meet government standards for safe radio-frequency radiation emission, but enough studies are beginning to document a possible【S3】______in rare brain tumors (肿瘤), headaches and behavioral disorders in children to cause concern. So far, the evidence isn’t【S4】______on whether the use of cell phones【S5】______to any increased risk of cancer. In a new trial, researchers asked 47 volunteers to【S6】______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【S7】______to each ear. During the first scan, the devices were turned off, but for the second scan, the phone on the right ear was【S8】______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【S9】______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【S10】______a whole new avenue for scientific inquiry, though it doesn’t say anything about whether cell-phone radiation can cause cancer.
A) conclusive I) mission
B) contributes J) participate
C) derive K) particular
D) expresses L) provides
E) fixed M) regions
F) immensely N) surprisingly
G) increase O) switched
H) maintain
【S3】
选项
答案G
解析 空格前面为形容词possible，后面为介词in，因此空格处需要填入名词。根据本句的句意，已有足够多的研究开始证明，罕见脑肿瘤、头痛及儿童行为失调等病症增加的可能性亟待引起关注，因此空格处应填入表示“增加”的名词，由此确定名词increase为本题答案。备选词语中有三个名词，mission“任务”和regions“区域，地区”均与此句要表达的意义不符，可以排除。
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