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
2016-09-28
54
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.
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
主旨大意题。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,故全文一直围绕手机是否会对大脑有害这一问题进行展开。故选A。
转载请注明原文地址:https://kaotiyun.com/show/bZRO777K
0
成人本科学位英语
相关试题推荐
ThismorningI(gotup)(late),(so)Icametoschooltenminutes(later).
Ihearmanyparentscomplainthattheirteenagechildrenarerebelling.Iwishitwereso.Atyourageyououghttobegrowinga
Howcloseparentsaretotheirchildren______astronginfluenceonthedevelopmentofthechildren’scharacter.
Hisparents______hismoney,soheisintroublenow.
Onthefirstdayofschooloneofmyclassmatesbeganatalkwithmethatchangedmylife.Shesaid,"Hi,handsome.MynameisR
The_________goalofthebookistohelpbridgethegapbetweenresearchandteaching,particularlythegapbetweenresearchers
APuttingthebottles,boxesandbooksbackBwheretheyCbelong,please.Don’tDleavethemonthedesk.
Shedoesn’tlikeherjob,butistoo______totrytofindanother.
NursingatBethIsraelHospitalproducesthebestpatientcarepossible.Ifwearetosolvethenursingshortage,hospitaladmin
Mybrotherlikeeatingverymuchbutheisn’tvery______aboutthefoodheeats.
随机试题
Thesocialsciencesareflourishing.Asof2005,therewerealmosthalfamillionprofessionalsocialscientistsfromallfields
25岁初孕妇,34周妊娠。近1周,体重增加4kg,心悸、胸闷、咳嗽1天入院。检查:血压150/110mmHg,心率110次/分,未闻及病理性杂音,呼吸28次/分,双肺底闻及细湿啰音,下肢水肿(+++),尿蛋白(++),30分钟尿量30ml,胎心率152次/
心包经的原穴是
原材料确定时,影响混凝土强度的决定性因素是()。
工程完工验收后,交建设单位保管的施工企业工程技术档案的内容不包括()。
不管企业期初是否存在未弥补的亏损,当期计提法定盈余公积的基数都是当期实现的净利润。()
根据以下资料,回答问题。2011年发现违法用地行为7.0万件,涉及土地5.0万公顷(耕地1.8万公顷),同比分别上升5.8%、11.0%(耕地下降2.4%)。立案查处违法用地案件4.2万件,涉及土地4.4万公顷(耕地1.5万公顷),同比分别上升2.5%
图4是某地的地质剖面图,请对下列问题作一些简要分析。如果在这里修建一条东西向地下隧道,应该选择甲地还是乙地?为什么?
土地作为一个国家的生命线,在一个国家的经济发展中发挥着不可替代的基础性作用。下列关于我国土地资源的说法,错误的是()。
文慧是新东方学校的人力资源培训讲师,负责对新入职的教师进行入职培训,其PowerPoint演示文稿的制作水平广受好评。最近,她应北京节水展馆的邀请,为展馆制作一份宣传水知识及节水工作重要性的演示文稿。节水展馆提供的文字资料及素材参见“水资源利用与节水(
最新回复
(
0
)