首页
登录
职称英语
Spending 50 minutes with a cell phone close to your ear is enough to change
Spending 50 minutes with a cell phone close to your ear is enough to change
游客
2024-01-16
20
管理
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. [br] What does the word "that" stand for in the second paragraph?
选项
A、Brain activity.
B、Her research findings.
C、The fact that cell phone use may cause cancer.
D、Her research progress.
答案
C
解析
细节题。that为指示代词,根据上句可知,Volkow的研究结果并没有说明手机是否会引发癌症,这一研究并没有表明这种结论。由此可知,这里的that指的是“手机是否会引发癌症”这一结论。故选C。
转载请注明原文地址:https://tihaiku.com/zcyy/3366668.html
相关试题推荐
Forthispart,youareallowed30minutestowriteacompositiononthetopicOn
TheInternethasbrought______bigchangesinthewaywework.A、aboutB、outC、bac
SpeakerA:Whatasurprise!Youchangedyourhairstyle.SpeakerB:Yes,andano
【B1】[br]【B17】A、changedB、replacedC、substitutedD、transplantedB介同用法。如果把by变为in
TheroleofwomeninBritainhaschangedalotinthiscentury,【C1】______in
TheroleofwomeninBritainhaschangedalotinthiscentury,【C1】______in
TheroleofwomeninBritainhaschangedalotinthiscentury,【C1】______in
TheroleofwomeninBritainhaschangedalotinthiscentury,【C1】______in
TheroleofwomeninBritainhaschangedalotinthiscentury,【C1】______in
TheroleofwomeninBritainhaschangedalotinthiscentury,【C1】______in
随机试题
[originaltext]M:Mikesaidhe’sgoingtostayupallnightstudyingforhisgeo
[originaltext]W:Mr.Kim.Lotsofpeoplearesufferingfrombeingunabletosle
[originaltext]W:Youdidn’thavetoomuchtroubledoingthatexperiment,didyo
某特长双车道公路隧道在修建过程中,采用地质雷达进行超前地质预报及衬砌质量的检测。
A.2~4天 B.5~7天 C.10~12天 D.30~40分 E.24
甲企业于2019年5月份委托乙工厂加工一批高尔夫球杆,甲企业提供原材料金额为10
如图所示,2008年10月12日在第十届中国国际高新技术成果交易会上,机器人“村
关于基金服务机构的法律责任,下列选项中正确的有()。 ①基金销售机构未
假定劳动产出弹性为0.7,资本产出弹性为0.3,劳动投入增长3%,资本投入增长5
调整胰岛素剂量最简便的检查是A.空腹静脉血糖B.空腹指尖血血糖C.糖化血红蛋白D
最新回复
(
0
)