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
【S2】
选项
答案H
解析 空格前面是名词Manufacturers，后面是连词that引导的宾语从句，因此空格处需要填入句子的谓语动词。前文中提到了使用手机对身体健康的影响几乎毫无定论，后面的that从句提到手机符合政府关于无线电频率辐射排放的安全标准，这很显然是手机制造商的态度和观点。因此，空格处需要填入一个表达态度和观点的动词，由此确定动词maintain为本题答案，意为“坚持认为”。备选词语中有八个动词，根据主语的形式，空格处需要填入动词原形，因此第三人称单数形式contributes，expresses，provides，以及过去分词fixed，switched可以直接排除，derive“源自”，participate“参加”，均不符合题意。
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大学英语四级

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