首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Spending 50 minutes with a cell phone close to your ear is enough to change brain cell activity in the part of the brain closest
Spending 50 minutes with a cell phone close to your ear is enough to change brain cell activity in the part of the brain closest
admin
2018-04-03
32
问题
Spending 50 minutes with a cell phone close to your ear is enough to change brain cell activity in the part of the brain closest to the antenna. But whether that causes any harm is not clear, scientists at the National Institute of Health said at a conference last month, adding that the study will not likely settle concerns of a link between cell phones and brain cancer. "What we showed is glucose (葡萄糖) metabolism (a sign of brain activity) increases in the brain in people who were exposed to a cell phone in the area closest to the antenna," said Dr. Nora Volkow of the NIH, whose study was published in the Journal of the American Medical Association. The study was meant to examine how the brain reacts to electromagnetic fields caused by wireless phone signals.
Volkow said she was surprised that the weak electromagnetic radiation from cell phones could affect brain activity, but she said the findings do not shed any light on whether cell phones cause cancer. "This study does not in any way indicate that. What the study does is to show the human brain is sensitive to electromagnetic radiation from cell phone exposures." Use of the devices has increased dramatically since they were introduced in the early 1955s, with about 5 billion cell phones now in use worldwide.
Some studies have linked cell phone exposure to an increased risk of brain cancers, but a large study by the World Health Organization did not offer a clear answer to this. Volkow’s team studied 47 people who had their brain examined while a cell phone was turned on for 50 minutes and another while the phone was turned off. While there was no complete change in brain metabolism, they found a 7 percent increase in brain metabolism in the region closest to the cell phone antenna when the phone was on.
Experts said the results were interesting, but urged that they be understood with great care. "Although the biological significance, if any, of increased glucose metabolism from too much cell phone exposure is unknown, the results require further investigation," Henry Lai of the University of Washington in the U. S. and Dr. Lennart Hardell of University Hospital in Sweden, wrote in an article in JAMA. "Much has to be done to further investigate and understand these effects." They wrote.
Which of the following is an appropriate title for this passage?
选项
A、Cell Phone Radiation: Is It Harmful?
B、Cell Phone Radiation: Is It Useful?
C、Cell Phone Radiation: Is It Healthy?
D、Cell Phone Radiation: Is It Weak?
答案
A
解析
主旨题。文章第一段提出手机辐射是否会引起脑癌这一问题,最后一段说需要做深入研究来调查其影响,全文一直围绕手机是否会对大脑有害这一问题进行展开,所以A选项正确。
转载请注明原文地址:https://kaotiyun.com/show/9qCO777K
0
成人本科学位英语
相关试题推荐
Forthispart,youareallowed30minutestowriteacompositiononthetopicOnlineChatting.Youshouldwriteatleast100wor
Forthispart,youareallowed30minutestowriteacompositiononthetopicSayNotoPiratedProducts.Youshouldwriteatle
SpeakerA:Whatasurprise!Youchangedyourhairstyle.SpeakerB:Yes,andanothersurprise,I’mgoingtogetmarriednextSat
TheroleofwomeninBritainhaschangedalotinthiscentury,【C1】______inthelasttwentyyears.Themainchangehasbeen【C2】_
TheroleofwomeninBritainhaschangedalotinthiscentury,【C1】______inthelasttwentyyears.Themainchangehasbeen【C2】_
TheroleofwomeninBritainhaschangedalotinthiscentury,【C1】______inthelasttwentyyears.Themainchangehasbeen【C2】_
TheroleofwomeninBritainhaschangedalotinthiscentury,【C1】______inthelasttwentyyears.Themainchangehasbeen【C2】_
随机试题
甲亢患者的甲状腺肿大程度与病情轻重一致。()
在环境温度为30℃时做剧烈运动。人体散热的途径有
某县居民吴某依法取得位于该县皇后大街西侧一块土地的建设用地使用权,吴某在该宗土地上建造三层楼房的申请得到了城建部门的批准,并领到了建筑许可证。由于资金不足,吴某盖到二层就封顶了,他准备积累资金以后再加盖第三层。吴某因做生意急需本钱,便将该楼房第一层转让给了
下列关于调解协议的说法中,正确的是:()
下列关于罪刑法定原则的内容,说法错误的是:
已知数字信号X和数字信号Y的波形如图7-60所示,则数字信号F=的波形为()。
()是指由租赁公司按照承租企业的要求融资购买设备,并在契约或合同规定的较长期限内提供给承租企业使用的信用性业务。
建筑工程项目质量管理的首要步骤是()。
首次公开发行股票招股说明书摘要包括招股说明书全文的各部分内容。
根据下列材料,回答问题。2017年全国举办马拉松赛事达1102场,其中,中国田径协会举办的A类赛事223场,B类赛事33场。2017年马拉松赛事的参与人次达到了498万人次,2016年、2015年马拉松赛事的参与人次分别为280万人次、150万人次。
最新回复
(
0
)