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
If you’ve traveled by airplane in the past few years, chances are you’ve walked through a full body scanner at the security chec
If you’ve traveled by airplane in the past few years, chances are you’ve walked through a full body scanner at the security chec
admin
2022-02-03
37
问题
If you’ve traveled by airplane in the past few years, chances are you’ve walked through a full body scanner at the security checkpoint.
The first generation of full body X-ray scanners rolled out in airports across the US in 2008. Known as backsatter scanners, there was a bit of an uproar from consumers when these came on the scene. Fliers feared the imaging would visually strip them of their clothes in front of the Transportation Security Administration (TSA) agents. Some health experts also worried that these models might expose people to unnecessary radiation.
But in 2013, the TSA replaced backscatter scanners with new-and-improved scanners, called millimeter wave screeners. They fixed the "see you naked"issue. These devices create a standard outline of a person, rather than a detailed image of the person’s body. They’re also an improvement for your health. The millimeter wave scanners use low power radio frequency waves to create the image. The frequency is the same as that used for Wi-Fi devices. If you stood for three seconds in a scanner, it would be no more radiation exposure than standing in front of your computer router at home.
Backscatter scanners, meanwhile, can still be found in other places like jails and courthouses. They do expose people to small amounts of X-rays, but the Food and Drug Administration (FDA) considers them safe. A person receives more radiation from naturally occurring sources in less than an hour of ordinary living than from one screening with any general-use X-ray security system, says the FDA. Yet others are not so convinced.
The European Union prohibits the backscatters. Some scientists believe that even very low level X-ray exposure could increase the risk of cancer. " I would agree that the individual risk associated with X-ray scanners is likely to be extremely small," says David Brenner, head of Columbia University’s Center for Radiological Research. "The issue of concern is when the X-ray scanners are used in a very high volume setting (just under a billion security screens occur each year in US airports). A very tiny risk multiplied by a billion has the potential to represent a public health issue. "
David Brenner’s remarks support the idea that________.
选项
A、low level X-ray exposure may become a health concern
B、exposure to X-rays is a common phenomenon in our life
C、tiny risks may develop into big threats to traffic safety
D、the European Union’s ban of backscatters is an overreaction
答案
A
解析
细节题。文章最后一段提到,哥伦比亚大学放射学研究中心主任戴维.布伦纳说:“我同意与X射线扫描仪相关的个体风险可能很小。令人担忧的问题是,当X射线扫描仪的使用量很高时(美国机场每年进行十亿次左右的安全检查)。很小的风险乘以十亿就有可能代表一个公共健康问题。”由此可知,戴维.布伦纳的评论支持低水平的X射线暴露可能成为一个健康问题。故选A。
转载请注明原文地址:https://kaotiyun.com/show/dGNd777K
本试题收录于:
公共英语三级笔试题库公共英语(PETS)分类
0
公共英语三级笔试
公共英语(PETS)
相关试题推荐
AspeciallabattheUniversityofChicagoisbusyonly【C1】______Itisadream【C2】______whereresearchersareatwork【C3】______d
Whatdoesthemanaskthewomantodo?
Whydoesthemangotothetravelagency?
Readthetextsfromthe"LETTERS"sectionofamagazineinwhichfivepeoplecommentedonthemagazinesstoryofBono,asuperst
Ifyouwanttostayyoung,sitdownandhaveagoodthink.ThisistheresearchfindingofateamofJapanesedoctors,whosayt
HowdotheAmericansthinkofthetaxi?
ItwasfifteenpastnineasMariehurriedintotheofficebuildingwhereshewasgoingtowork.Herbushadinchedalongthrough
TofindKimHyungGyoon’sofficeinSamsung’sR&Dcomplex,iustfollowthebasketsofdirtyclothes.No,Kimisnotrunningtheco
WehaveHeardalotaboutthehealthbenefitsoftea,especiallygreentea.Itishighinpolyphenols,compoundswithstrongan
WehaveHeardalotaboutthehealthbenefitsoftea,especiallygreentea.Itishighinpolyphenols,compoundswithstrongan
随机试题
关于伤口二期愈合的瘢痕,下列哪些描述是正确的
关于条约的缔约权,下列说法错误的是:()
某新建高速公路位于2类声环境功能区,经计算距高速公路中心线150m和360m处夜间噪声贡献值分别为55dB(A)和50dB(A)。根据《环境影响技术导则一声环境》,该项目声环境影响评价范围应为高速公路中心线两侧()m范围内。
甲公司系增值税一般纳税人,不动产适用的增值税税率为11%,按净利润的10%提取盈余公积。甲公司采用成本模式对投资性房地产进行后续计量。不考虑其他因素,有关资料如下:资料一:2015年12月18日甲公司与乙公司签订租赁合同,甲公司将一栋办公楼整体出租给乙公司
物业管理企业的财务管理包括营业收入管理、成本和费用管理、利润管理以及()。
闲暇时光,或_______在暖阳里,或_______在清风中,泡一壶香茗,在茶香的氤氲中轻轻地打开书卷,让一个个灵魂的文字,跳进眼眸,拨动心弦,这难道不是一种最优雅的姿态?填入画横线部分最恰当的一项是:
一、注意事项1.申论考试与传统的作文考试不同,是分析驾驭材料的能力与表达能力并重的考试。二、给定资料1.一场始料不及的百年大旱,暴露了水资源保护方面的种种问题。当前,水污染事件数量日益增多、频率逐渐加快、影响愈加严重。保护水资源,关乎民生,刻不容缓。
将E—R图转换为关系模式时,实体和联系都可以表示为()。
编写如下程序代码:OptionBase1PrivateSubCommand1_Click()DimarrAsVariantDimiAsInteger,nAsInteger,sAsInteg
Itwasin1969______theAmericanastronautsucceededinlandingonthemoon.
最新回复
(
0
)