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、The atmosphere and our environment. B、Research radiations. C、Effects of space radiation. D、Importance of protection against ra
A、The atmosphere and our environment. B、Research radiations. C、Effects of space radiation. D、Importance of protection against ra
admin
2009-09-12
60
问题
Space is a dangerous place because of rays from the sun and other stars. The atmosphere again acts as our protective blanket on earth. Light gets through, and this is essential for plants to make the food which we eat. Heat, too, makes our environment endurable. Various kinds of rays come through the air from outer space, but enormous quantities of radiation from the sun are screened off. As soon as men leave the atmosphere they are exposed to this radiation but their spacesuits or the walls of their spacecraft, ff they are inside, do prevent a lot of radiation damage. Radiation is the greatest known danger to explorers in space. The trouble is that it is extremely difficult to be sure about radiation damage--a person may feel perfectly well, but the cells of his or her sex organs may be damaged, and this will not be discovered until the birth of deformed children or even grandchildren. Missions of the Apollo flights have had to cross belts of high radiation and, during the outward and return journey, the Apollo crew accumulated a large amount of rems, the unit of radiation. So far, no dangerous amounts of radiation have been reported, but the Apollo missions have been quite short. We simply do not know yet how men are going to get on when they spend weeks and months outside the protection of the atmosphere, working in a space laboratory. Drugs might help to decrease the damage done by radiation, but no really effective ones have been found so far.
选项
A、The atmosphere and our environment.
B、Research radiations.
C、Effects of space radiation.
D、Importance of protection against radiation.
答案
C
解析
[听力原文]
What’s the main idea of this passage?
由各选项的形式猜测本题考查文章主题。文章谈到了太空辐射的害处,并举例说明其影响和作用,故正确答案为C)。
转载请注明原文地址:https://kaotiyun.com/show/nT37777K
0
大学英语四级
相关试题推荐
TheAmazonMysteryA)Ifthere’sasentencethatsumsupAmazon,theweirdestmajortechnologycompanyinAmerica,it’sone
A、ThemedievalHaddonHall.B、ThePalaceofthePeak.C、Chatsworth.D、ThePeakDistrictNationalPark.D原文中提到,位于PeakDistrict中心
A、Divinggear.B、Swimsuits.C、Cookingequipment.D、Afridge.B原文中,男士告诉女士需要带上泳装,因为那里有沙滩和河,故答案为B。
A、Itisthemanwhoistalkingthatsetupthebusiness.B、Therewasmorecompetitioninthebusinessabout30yearsago.C、Ther
A、Heisluckytobeabletodowhatheloves.B、Heisabletomeetmanyinterestingpeople.C、Heisabletoforgetallthetroub
TheBody-dataCrazeA)Welcometomybiography,2013-style.Itincludesmoredatapointsthanitpossiblycouldhave20year
Criticsofrenewableenergyoftenarguethatwindandsolarpowerare"boutique’’’(精品)energysourcesthatcouldnever【C1】_____
A、Qatarwilldevelopitsfootballinthefuture.B、QatarspendshugemoneyonWorldCupinfrastructureprojects.C、Qatargetsth
In1915EinsteinmadeatriptoGottingentogivesomelecturesattheinvitationofthemathematicalphysicistDavidHilbert.H
A、Teenshadmoremeanstomakefriends.B、Teenshadlesslongingformorefriends.C、Teenshadbetterunderstandingoffriendshi
随机试题
TheCognitiveApproachlaysemphasisonthe______acquisitionoflanguageasameaningfulsystem.
恶寒重,发热轻,无汗,头痛,肢节酸疼,鼻塞声重或鼻痒喷嚏,时流清涕,咽痒,咳嗽,痰吐稀薄色白,口不渴或渴喜热饮,舌苔薄白而润,脉浮紧,辨证为
胰岛β细胞瘤糖尿病
加班是指劳动者在标准工作日以外延长工作的时间。()
波长为λ的单色光垂直照射在折射率为n的劈尖薄膜上,在由反射光形成的干涉条纹中,第五级明条纹与第三级明条纹所对应的薄膜厚度差为()。[2013年真题]
CBA的中文名称是()。
甲、乙签订一份购销合同。甲以由银行承兑的汇票付款,在汇票的背书栏记载有“若乙不按期履行交货义务,则不享有票据权利”,乙又将此汇票背书转让给丙。下列对该票据有关问题的表述哪些是正确的?()
教师有下列情形之一的,由所在学校、其他教育机构或者教育行政部门给予行政处分或者解聘。()
下列有关清末商事立法的表述,错误的有()。
数据流图中带有箭头的线段表示的是()。
最新回复
(
0
)