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
2024-01-17
9
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(天线). 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(代谢)(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(电磁辐射)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 1955 s, 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] Doctor Volkow was astonished because______.
选项
A、her research has shed light on her understanding of cell phone
B、she found that cell phone exposure is harmful to human brain
C、she found that using a cell phone for about 50 minutes could influence or change brain activity
D、human brain is not responsive to electromagnetic radiation
答案
C
解析
事实细节题。根据第二段第一句话,即沃尔考说,手机发出的弱电磁辐射可能会影响大脑的活动,她对此很惊讶…。故选C。
转载请注明原文地址:https://tihaiku.com/zcyy/3370081.html
相关试题推荐
Forthispartyouareallowed30minutestowriteacompositiononthetopic:C
TheInternethasbrought______bigchangesinthewaywework.A、aboutB、outC、up
Hewas______enoughtoseethatJakewasthebestcandidateforthejob.A、sensibl
Please______usofanychangesinyourcircumstanceswhenyouareawayfromhome.
TheresponsetotheconcertwasnotwarmenoughsoIdecidedtopostponeticket
Forthispart,youareallowed30minutestowriteacompositiononthetopic"M
Forthispart,youareallowed30minutestowriteacompositiononthetopic"
Areyou______spendingmoremoneyonthespaceprogram?A、infavorofB、byfavoro
Spending50minuteswithacellphoneclosetoyourearisenoughtochange
Spending50minuteswithacellphoneclosetoyourearisenoughtochange
随机试题
[originaltext]FromCaliforniatoConnecticut,babiessitonthelapsofthe
七夕节是在农历七月初七庆祝的,也被称作“乞巧节(BeggingforSkillsFestival)”。在中国有很多关于七夕节起源的民间传说,其中最
OceanadventurerPeterBlaketaughtlessonseveryleadershouldknow
[originaltext]HowoftendoyouhaveanEnglishtest?[/originaltext]A、Sincelast
对于核销后的呆账,金融企业要继续尽职追偿,尽最大可能实现()。A.债务的清
下列属于间隔层的设备是()。保护装置;规约转换器;远动通信工作站;逆
国家电网公司变电运维管理规定中规定三类变电站包括()。除二类以外的220k
临床治疗虚衰病证,为求阴阳相济,在补阴时适当配用补阳药,此为( )。A.阴中求
下列关于资本市场线的经济意义,说法错误的是()。A:资本市场线方程对有效组合的期
(2015年真题)W航空公司以“家庭式愉快,节俭而投入”的企业文化为基础,构建起
最新回复
(
0
)