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
2017-06-29
69
问题
[9]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. [10]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. [11]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/hfU7777K
0
大学英语六级
相关试题推荐
Acupuncture(针灸)isbasedontheideathatenergyflowsthroughthehumanbodyalong12linesormeridians(经脉).Thesemeridians【B1
Everybody’sultimategoalinlifeistobesuccessfulandhappy.Eachperson’s【B1】______ofsuccessisdifferent.Manypeoplef
WhatisAprilFoolsDayandwhatareitsorigins?Itis【B1】______believedthatinmedievalFrance,NewYearwascelebratedon1
A、Theviolinwastooexpensive.B、Shewastooyoungtoplaytheviolin.C、Theviolinwastoobigforher.D、Hermotherwantedhe
Haveyoueverwantedtotravelbackthroughtimeandseewhatlifewaslikeatthedawnofman?Well,museumscanmakehistory【B
A、Itrequirestoomuchtravelingtodifferentcities.B、Itlimitsinteractionamongstudents.C、Itwillincreaseclasssize.D、I
A、Thewoman’sjobasalibrarian.B、Women’srightsinsociety.C、Animportantelection.D、Careerplanning.B女士说事实上男女还是不平等,男士不同意,
A、SheisthesupervisoroftheHRdepartment.B、HerfriendisthesupervisoroftheHRdepartment.C、Shecanhelpthemantoget
Negotiationsworkwonders.Thisisparticularlysoininternationalbusinesssinceitismostlythroughnegotiationsthatexport
A、Oneofthestudentsaskedhimaboutitinthepreviousclass.B、Hereadaboutitthepreviousday.C、HehadjustreadDr.Fred
随机试题
铜合金管耐蚀性较强,常用于输送()液体、气体原料。
《刑事诉讼法》第96条规定,犯罪嫌疑人在被侦查机关之日起,可以聘请律师。()
泪膜的主要功能不包括
A.真武汤合附桂八味丸B.君子汤合丹栀逍遥散C.味地黄丸合大补阴丸D.犀角地黄汤合黄连解毒汤E.逍遥散合血府逐瘀汤
下列哪项不是脾的生理功能
()是以社会折现率或财务基准收益率分别计算各方案的等额费用,并进行比较,以年费用较低的方案为优。
下列选项中关于个人存款业务的表述,错误的有()。[2015年10月真题]
1.互联网金融出现时间短,发展快,趋势良好,虽然电子银行替代率不断提升,但无论从短期还是中长期看,银行在金融业的地位都是难以代替的。区别于网络支付的最大不同,在于传统银行有实体营业网点,实体经济拓展到哪里,银行的实体网点就会发展到哪里,实体网点到
罗杰斯的“以学生为本”“让学生自发学习”“排除对学习者自身的威胁”的教学原则属于()
录入:打印
最新回复
(
0
)