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、It is insignificant. B、It is enormous. C、It seems overestimated. D、It remains unknown. D[听力原文] What’s the result of harm radia
A、It is insignificant. B、It is enormous. C、It seems overestimated. D、It remains unknown. D[听力原文] What’s the result of harm radia
admin
2009-09-12
41
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、It is insignificant.
B、It is enormous.
C、It seems overestimated.
D、It remains unknown.
答案
D
解析
[听力原文]
What’s the result of harm radiation done to the Apollo members?
由选项推测本题考查关于it的信息。文中关键句为“no dangerous amounts of radiation have been reported”,意思是危险射线还是未知的,故正确答案为D)。
转载请注明原文地址:https://kaotiyun.com/show/9T37777K
0
大学英语四级
相关试题推荐
Sustainabledevelopmentisappliedtojustabouteverythingfromenergytocleanwaterandeconomicgrowth,andasaresultith
Fearresponsescanonlybeerasedwhenpeoplelearnsomethingnewwhileretrievingthefearmemory.Thisistheconclusionofa
A、Heisgoodwithchildren.B、HeisfamousonlyattheWestCentre.C、Heisgoodattreatinglegtrouble.D、Heisoneofthetwe
HowMarketersTargetKidsA)Kidsrepresentanimportantdemographictomarketersbecausetheyhavetheirownpurchasingpo
A、Theyreleaseharmfulsubstanceswhentheyareburned.B、Theydissolveinthewaterandcauseawasteofwater.C、Theyrelease
Forthispart,youareallowed30minutestowriteanessayonemotionmanagement.Youshouldwriteatleast150wordsbutnomo
A、Theirdifferencesarelikelytoimpactproductivity.B、Theirsimilarityisconducivetofuturecollaboration.C、Theirconnecti
A、Friendsaremorealikebrothersandsisters.B、Itissimpleforfriendstostartaconversation.C、Friendshavesomegenesin
A、Lookattheminadifferentway.B、Askyourfriendsforcomfort.C、Learnagoodlessonfromit.D、Makemovestochangeit.D
A、Theyareinterestedinthemarket.B、Theyareinterestedinnaturelifeandsports.C、Theycanchangethestrategyquickly.D、
随机试题
SDH同步数字传输系统中STM-1代表的传输速率为()。
简述国际市场竞争的新特点。
心尖搏动的强弱及范围变化的生理条件是()
关于体位与疾病关系的叙述,错误的是
关于垂体瘤。下列哪项正确
A.医乃仁术B.疏五过论C.勤求古训,博采众方D.医家必须具备精湛的医术和高尚的医德E.“精究方术,爱人知人”中国传统医学普遍信奉的职业原则是()
受力情况相同的三种等截面梁,如图5-34所示。若用(σmax)1,(σmax)2,(σmax)3分别表示这三种梁内横截面上的最大正应力,则下列结论中正确的是()。
Severalresearchteamshavefoundthatnewbornsprefertheirmothers’voicesoverthoseofotherpeople.Nowateamofscientist
根据以上资料,能够推出的是:
Alargepartofeffectiveleadershipisdependentonsomethingcalled"style".Butstyleisdifficulttoteach,andwhatmakeso
最新回复
(
0
)