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
68
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
A、Therolesofthefather,mother,andchildrenhavechanged.B、Anincreasingnumberofwomenworkoutsidethehome.C、Changesh
HowMarketersTargetKidsA)Kidsrepresentanimportantdemographictomarketersbecausetheyhavetheirownpurchasingpo
HowMarketersTargetKidsA)Kidsrepresentanimportantdemographictomarketersbecausetheyhavetheirownpurchasingpo
Beinginaclassroomfullof"thebestandbrightest"studentsmaynothelpfringeones,accordingtonewresearchthat【C1】_____
Antarctica’svast,frozen,barrenlandscapehasbeckonedscholarsand【C1】________alikeformorethanacentury.Indeed,thehist
IntotheUnknownA)Theworldhasneverseenpopulationageingbefore.Canitcope?B)Untiltheearly1990snobodythou
Softrobotsmaynotbeintouchwithhumanfeelings,buttheyaregettingbetteratfeelinghumantouch.CornellUniversityrese
A、Informchildrenofthefamily’sfinancialsituation.B、Shiftchildren’sattentiontointerestingactivities.C、Involvechildre
A、Itenablespeopletoearnmoremoney.B、Itteachestheimportanceoffinancing.C、Ithelpspeoplewithbudgeting.D、Itintrodu
A、Knowwhattelevisionisbestforhim.B、Askforacheaperpriceonthetelevision.C、Changeastoretobuyadifferenttelevis
随机试题
ResearchershavefoundthatREM(rapideyemovement)sleepisimportanttohumanbeings.Thistypeofsleepgenerallyoccursfour
出生后人体最主要的造血组织是
男,7个月,用力哭时,常发生气短,诊断为过度肥胖。不属于肥胖症的治疗原则的是()
将带有租赁契约的土地进行转让、收回、征收或调整租金时,一般要进行()评估。
在计算资产的流动性时,()的资产均要从各类流动性资产中扣除。
2010年我国在线教育市场规模为491.1亿元,到2015年在线教育市场突破千亿元大关达1171亿元。与热闹的市场相对的是,行业整体面临较大的盈利困难。截至2015年年底,我国约有9500家从事互联网教育的公司,经过对其中400家在线教育平台调查发现.
根据下面材料回答问题。2006年2月份,居民消费价格总水平比2005年2月上涨2.7%,其中城市上涨2.5%,农村上涨3.2%:食品价格上涨6.0%,非食品价格上涨1.0%;消费品价格上涨3.0%,服务项目价格上涨1.8%。从月份比较,居民消费价
按表意功能,镜头剪辑一般分为叙事剪辑与()两大类。
软件工程的理论和技术性研究的内容主要包括软件开发技术和()。
汉字(Chinesecharacter)是世界上最古老的文字之一,其历史可以追溯到5000年前。
最新回复
(
0
)