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
【S8】
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，provides均可以直接排除，另一过去分词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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大学英语四级

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