Theworldwideincreaseintheuseofcellphoneshascausedconcer...
问题详情:
The worldwide increase in the use of cellphones has caused concerns regarding possible harmful effects caused by cellphone radiation. people are particularly concerned that the radiation will put cellphone users at a higher risk of suffering from cancer. However, studies of the association between cellphone use and the risk of brain cancer have reached different conclusions(some, but not all, studies showed increased risk).
Researchers conducted a study to examine if cellphone radiation affected regional activity in the human brain. The study, conducted between January 1 and December 31, 2009,included 47 participants. Cellphones were placed on the left and right ears, and brain imaging was performed to measure brain glucose metabolism(葡萄糖代谢) twice: one with the right cellphone activated for 50 minutes(“on” condition) and once with both cellphones deactivated(“off” condition). An analysis was conducted to check the association of metabolism and cellphone radiation. The scans were compared to assess the effect of cellphone use on brain glucose metabolism.
The researchers found that whole-brain metabolism did not differ between the on and off conditions. However there were regional effects. Metabolism in some brain region was higher (about 7 percent) for cellphone on than for cellphone off conditions. This indicates that the regions expected to absorb more cellphone radiation were the ones that showed the larger increases in glucose metabolism.
These results provide evidence that the human brain is sensitive to the effects of acute(剧烈的) cellphone radiation. However, how cellphone radiation could affect brain glucose metabolism is unclear.
Concerns have been raised by the possibility that cellphone radiation may induce brain cancer. Results of this study provide evidence that acute cellphone radiation affects brain metabolic activity. However, these results provide no information as to their connection regarding possible carcinogenic(致癌的) effects (or lack of such effects) of chronic(长期的) cellphone use.
Further studies are needed to assess if these effects could have long-term harm.
67. What does the passage mainly talk about?
A. The current situation of cellphone use.
B. To phone or not to phone.
C. The link between cellphone use and brain cancer.
D. Long-term harmful effects of cellphones.
68. What can we learn from the first paragraph?
A. The future of the cellphone market is not so bright.
B. The issue whether cellphone use causes brain cancer remains unsettled.
C. Worrying about radiation, more and more people will give up their cellphones.
D. Cellphone radiation affects brain function but it doesn’t lead to brain cancer.
69. The study in the passage tells us .
A. the whole-brain metabolism is not affected by cellphone radiation
B. how cellphone radiation affects brain glucose metabolism
C. studies on the relationship between cellphone use and brain cancer are useless
D. glucose metabolism in the brain regions absorbing more cellphone radiation decreases
70. The underlined word “induce” in the passage can be replaced by “ ”.
A. reduce B. introduce C. cause D. suggest
【回答】
CBAC
知识点:阅读理解
题型:阅读理解
-
打秋千时,为使秋千越荡越高,人应有一个从直立到蹲下,又从蹲下到站直的过程.则打秋千时 A.人的机械能是守...
问题详情:打秋千时,为使秋千越荡越高,人应有一个从直立到蹲下,又从蹲下到站直的过程.则打秋千时 A.人的机械能是守恒的 B.人应在最低点站起来 C.人应在最高点站起来 D.人在最低点时失重【回答】C知识点:未分类题型:选择题...
-
某班抽取6名同学进行体育达标测试,成绩如下:80,90,75,80,75,80.下列关于对这组数据的描述错误的...
问题详情:某班抽取6名同学进行体育达标测试,成绩如下:80,90,75,80,75,80.下列关于对这组数据的描述错误的是( )A.众数是80 B.平均数是80 C.中位数是75 D.极差是15【回答】C知识点:数据的集中趋势题型:未分类...
-
已知铁的一种氧化物,其中含氧元素的质量分数为30%,则这种铁的氧化物的化学式为 ( ) A.FeO ...
问题详情:已知铁的一种氧化物,其中含氧元素的质量分数为30%,则这种铁的氧化物的化学式为()A.FeO B.Fe2O3C.Fe3O4 D.无法判断【回答】B知识点:金属的化学*质题型:选择题...
-
已知(1+ɑx)(1+x)5的展开式中x2的系数为5,则ɑ=( )A、-4 B、-...
问题详情:已知(1+ɑx)(1+x)5的展开式中x2的系数为5,则ɑ=( )A、-4 B、-3 C、-2 D、-1【回答】D知识点:计数原理题型:选择题...
相关文章
- Thewinnerofthe2015NobelPrizeinEconomicSciencesstudiesho...
- “ThreeApples”changedtheworld.Thefirstoneseduced(引诱)Eve...
- Completethefollowingsentencesasrequired(根据所给要求完成句子。1-6小...
- 用所给单词的适当形式填空。1.TomdoeswellinChinese;howeverLucydoesChin...
- Completethefollowingsentencesasrequired.(根据所给要求完成句子。每空格...
- Theoddnessoflifeinspaceneverquitegoesaway.Herearesomeex...
- (2019·全国卷Ⅱ)Thecoachisabletofocusonthekidswhiletheotherp...
- Weallknowthat2016isconsideredtheyearofsuperheromovies....
- Forthosewhostudythedevelopmentofintelligence(智力)inthean...
- Completethefollowingsentencesasrequired(根据所给要求完成句子。每空格限...