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
3
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] According to the passage, cell phones were launched______.
选项
A、in the late 1970s
B、between 1955 and 1960
C、in the late 1955 s
D、in the early 1990s
答案
B
解析
细节题。定位到文章第二段最后一句“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.”题干中的“launched”与“introduced”同义。故选B。
转载请注明原文地址:https://tihaiku.com/zcyy/3366667.html
相关试题推荐
Forthispart,youareallowedthirtyminutestowriteacompositiononthetopi
Forthispart,youareallowedthirtyminutestowriteacompositiononthetopi
Howcanwegetridofgarbage?Dowehaveenoughenergysourcestomeetour
Howcanwegetridofgarbage?Dowehaveenoughenergysourcestomeetour
Forthispart,youareallowedthirtyminutestowriteacompositiononthetopi
Itwaswithgreatjoy()heknewthathisGMATscoreas670,highenoughtoapply
Forthispart,youareallowedthirtyminutestowriteacompositiononthetopi
Thelittlevillagehasn’tchangedmuch()anewroadandtwomorestores.A、except
IsthereenoughoilbeneaththeArcticNationalWildlifeRefuge(保护区)(ANWR)to
IsthereenoughoilbeneaththeArcticNationalWildlifeRefuge(保护区)(ANWR)to
随机试题
Thispassagemainlytellsthatbeingunemployedisnotallbad.[br]LisaPerez
Whichofthefiguresbelowthelineofdrawingsbestcompletestheseries?[img]
下列关于时间坐标网络计划的说法中,正确的是()。A.更能够表达进度计划中各
Mostofushaveexperiencedtheoddfeel
依据《建筑施工企业安全生产管理机构设置及专职安全生产管理人员配备办法》,建设工程
滑坡事故防治技术包括()。A.改进工艺 B.制定严格的边坡安全管理制度 C
关于肺循环的生理特点正确的是()。A.肺循环血流阻力较体循环大 B.肺动脉压
制定起草企业绩效管理制度的基本要求是( )。A.明确性与具体性 B.全面性与
(2021年真题)关于我国货币制度的说法,错误的是()A.人民币采取不兑现纸
在乙型肝炎患者血清中。不能检测到的乙肝病毒标记物是A.HbsAg B.抗-HB
最新回复
(
0
)