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
A、Traffic accidents. B、Radiation. C、Train travel. D、Air crash. B原文提及“不久前人们认为在太空中会遭遇到严重的威胁,主要有辐射和流星撞击”。故B正确。
A、Traffic accidents. B、Radiation. C、Train travel. D、Air crash. B原文提及“不久前人们认为在太空中会遭遇到严重的威胁,主要有辐射和流星撞击”。故B正确。
admin
2021-09-17
76
问题
Not long ago it was assumed that the dangers man would meet in space would be terrible, the main ones being radiation and the danger of being hit by meteors. It is perhaps worth remembering that less than two centuries ago the dangers of train travel seemed similarly terrible. A man would certainly die, it was thought, if carried along at a speed of thirty kilometers per hour.
There are two sorts of radiation man must fear in space. The first is radiation from the sun, and this is particularly dangerous when the sun is very active and explosions are occurring on its surface. The second, less harmful form comes from the so-called Van Allen Belts. These are two areas of radiation about 1,500 miles away from the earth. Neither of these forms of radiation is a danger to us on the earth, since we are protected by our atmosphere. Specifically, it is that part of our atmosphere known as the ozonosphere which protects us. This is a belt of the chemical ozone between 12 and 21 miles from the ground, which absorbs all the radiation.
Once outside the atmosphere, however, man is no longer protected, and radiation can be harmful in a number of ways. A distinction must be drawn between the short- and long-term effects of radiation. The former are merely unpleasant, but just because an astronaut returning from a journey in space does not seem to have been greatly harmed, we cannot assume that he is safe. The long-term effects can be extremely serious, even leading to death.
9.What was one of the main dangers man would meet in space?
10.When is the sun radiation particularly dangerous to human beings?
11.Why did the speaker say neither of these forms of radiation is a danger to us?
选项
A、Traffic accidents.
B、Radiation.
C、Train travel.
D、Air crash.
答案
B
解析
原文提及“不久前人们认为在太空中会遭遇到严重的威胁,主要有辐射和流星撞击”。故B正确。
转载请注明原文地址:https://kaotiyun.com/show/ivD7777K
0
大学英语六级
相关试题推荐
TryingtooHardCanSlowNewLanguageDevelopmentA)Neuroscientistshavelongobservedthatlearningalanguagepresentsadiffe
It’sHardtoCleanBigDataA)KarimKeshayjee,aTorontophysiciananddigitalhealthconsultant,crunchesmountainsofdatafro
TheInvisibleFuelProvidesEnsuranceforEnergySecurityintheFutureA)Whenenergyeconomistsgazeintotheircrystalballst
A、Thefunnydialogues.B、Thespecialeffects.C、Theoutstandingactors.D、Themysteriousroles.B
A、Theyhaveoverwhelmingadvantages.B、Theyaresoldatverylowprices.C、Theyarethesymbolofpeople’sstatus.D、Theymeetc
TheCleanEnergyTransitionWillTransformOurEconomyBeyondRecognition[A]InNovember2013,morethan15,000scientistsr
TheCleanEnergyTransitionWillTransformOurEconomyBeyondRecognition[A]InNovember2013,morethan15,000scientistsr
Dreamsareastateofconsciousness,anexperiencethatyouhavewhenyouareasleep.Whenyoudreamsomethingyouhaveanexper
A、DoubtfulB、Supportive.C、Opposing.D、Neutral.C短文提到,政府机构坚决反对标签提供更多的信息,C的Opposing(反对)与短文的disagreedstrongly一致,故正确。
A、Nothingbutthedarkness.B、Firefliesblinkingeverywhere.C、Aworldoflightinganimals.D、Wreckageofancientships.C录音开头演讲
随机试题
氧气瓶的安全使用,不能进行的操作是()。
2007年9月25日,当选日本第91任首相的是( )
决定生产性毒物进人人体剂量的最主要因素是
患者,女,29岁。产后1个月。产后乳汁不行,乳房胀满疼痛,情志抑郁不乐。治疗除取主穴外,还应选用的是
功能分析是价值工程活动的一个重要环节,它包括功能()。
应急柴油发电机的进风口面积一般应如何确定?(2003,103)
某企业职工李某在2009年年底与一服装集团签订承包协议,开始承包所属的一家服装厂,承包期为2010~2011年共2年,2011年取得以下收入:(1)2011年根据承包协议和服装厂的效益,分两次取得承包收入:上半年分得35000元,年底又分得40000元。
评价会议成功与否,首先要()。
以下组织属于社团法人的是()。
A、Itshortenstheeatingtime.B、Itcheersupcustomers’mind.C、Itsatisfiescustomers’fastpace.D、Itisverypopularamongc
最新回复
(
0
)