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
39
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.
According to the passage, which of the following is TRUE?
选项
A、Cell phone use is dangerous.
B、Cell phone use causes cancer.
C、The human brain is an electromagnetic field.
D、There are about 5 billion cell phone users in the world right now.
答案
D
解析
事实细节题。根据第二段最后一句话“自从20世纪80年代初期手机进入市场以来,手机用户急剧增加,目前全世界使用的手机约有50亿部。”可知D正确。根据第一段第二句“But whether that causes any harm is not clear...”可知手机辐射引起脑细胞活动改变是否对身体有害尚不清楚,故排除A、B。根据第一段最后一句话可排除C。故选D。
转载请注明原文地址:https://kaotiyun.com/show/nZRO777K
0
成人本科学位英语
相关试题推荐
Thebookwasso(bored)thatI(returned)it(tothelibrary)without(finishing)it.
Howcanwegetridofgarbage(垃圾)?Dowehaveenoughenergysourcestomeetourfutureenergyneeds?Thesearetwoimportan
Johnisnot(enoughintelligent)(topass)(this)(economics)classwithouthelp.
Butifallofthemhadworkedseparatelyandindependentlywithoutdivisionoflabor,theycertainlycouldnothavemadetwenty
______everyoneelsewouldn’tgotothemountainarea,hewentwithoutasecondthought.
Shedoesn’tlikeherjob,butistoo______totrytofindanother.
NursingatBethIsraelHospitalproducesthebestpatientcarepossible.Ifwearetosolvethenursingshortage,hospitaladmin
Isupposethatthemostbasicandpowerfulwaytoconnecttoanotherpersonistolisten.Justlisten.Perhapsthemostimportan
Whenitcomestoeatingsmartforyourheart,thinkingaboutshort-termfixesandsimplifylifewithastraightforwardapproac
Whenitcomestoeatingsmartforyourheart,thinkingaboutshort-termfixesandsimplifylifewithastraightforwardapproac
随机试题
我国传统礼俗最根本的特性是()
1993年7月,拉开了国企海外直接上市序幕的是______。
评标的准备和初步评审的工作不包括()。
概率保证程度表达了区间估计的()。
对于时下流行的“月光族”,最需要进行的是()
分析招标物业项目的定位要从投标物业项目的内部条件和外部环境入手,了解物业的(),调查物业所在地域的人文环境、经济环境、政治及法律环境,具体包括物业所在地域的法规政策,政府管理,社会文化传统与风俗习惯,居民收入与消费水平,物业所在区域的位置、交通条件、商
周婷、杨兴《别了,“不列颠尼亚”》原文在香港飘扬了150多年的英国米字旗最后一次在这里降落后,接载查尔斯王子和离任港督彭定康回国的英国皇家游轮“不列颠尼亚”号驶离维多利亚港湾——这是英国撤离香港的最,后时刻。英国的告别仪式是30日下午
某服装专卖店提供两种促销方式供消费者选择。消费者可以全价购买一件价格较高的服装,获赠一件价格较低的服装,而所有不参加买赠活动的服装均可享受7折优惠。张女士准备买3件价不同的服装,已知其中两件的价格之和是另一件价格的2倍,且任一件服装的价格不超过另一件的2倍
TVissooftenaparent’sgoodMend,keepingkidshappilyoccupiedsothegrownupscancookdinner,answerthephone,ortakea
Dopeoplewhochoosetogoonexotic,far-flungholidaysdeservefreehealthadvicebeforetheytravel?Andeveniftheypay,wh
最新回复
(
0
)