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
专升本
Space is a dangerous place, not only because of meteors but also because of rays from the sun and other stars. The atmosphere ag
Space is a dangerous place, not only because of meteors but also because of rays from the sun and other stars. The atmosphere ag
admin
2019-04-11
5
问题
Space is a dangerous place, not only because of meteors but also 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, if they are inside, do prevent a lot of radiation damage.
Radiation is the greatest known danger to explorers in space. The unit of radiation is called "rem". Scientists have reason to think that a man can put up with far more radiation than 0. 1 rem without being damaged:the figure of 60 rems has been agreed on. 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(畸形的)children or even grandchildren. Missions of the Apollo flights have had to cross belts of high radiation and,during the outward and return journeys,the Apollo crew accumulated a large amount of rems. 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.
We know from the passage that______.
选项
A、exposure to even tiny amounts of radiation is fatal
B、the effect of exposure to radiation is slow in coming
C、radiation is avoidable in space exploration
D、astronauts in spacesuits needn’t worry about radiation damage
答案
B
解析
由第二段第四句可知,辐射对人体的危害一时难以显现,它可能会在其子女或孙子女的身上体现出来。B项符合题意,故选B。
转载请注明原文地址:https://kaotiyun.com/show/RSaC777K
本试题收录于:
英语题库成考专升本分类
0
英语
成考专升本
相关试题推荐
ThenumberofspeakersofEnglishinShakespeare’stimeisestimatedtohavebeenaboutfivemillion.Todayitisestimatedthat
Alaska,whichwascalledRussianAmericabeforeitwassoldtotheUnitedStatesofAmerica,joinedtheunionastheforty-ninth
Whentherearesmallchildrenaround,itisnecessarytoputbottlesofpillsoutof______.
I’veworkedheresinceI______HarvardBusinessSchool.
A.Whydidn’tyougototheconcertlastnightB.Thatwasn’tallthatterribleC.What’sthetemperatureD.Iwillgowithyou
Startedin1636,HarvardUniversityistheoldestofallthemanycollegesanduniversitiesintheUnitedStates.Yale,Princeto
PresidentCoolidge’sstatement,"ThebusinessofAmericaisbusiness,"stillpointstoanimportanttruthtoday—thatbusiness
YouareaGermanlivinginBerlin.Onedayyou’rewalkingdowninastreetmindingyourownbusiness,whensuddenlyastranger
Dopeopleeverywhereagreeonwhatamountainis?Thefactisthatdefinitionsvary.Everyoneadmits,forexample,thatEverest
Thefacilitiesoftheolderhotel______.
随机试题
Haveyoueverbeentemptedtocutacornerortotaketheeasiestroute,thoughyouknowitmaynotnecessarilybethebestone?
应用铁注射剂时,应注意下列哪些事项()(1990年)
患者女,38岁,类风湿关节炎1年,现午后发热,盗汗,口干咽燥,手足心热,关节肿胀疼痛,小便赤涩,大便秘结,舌红少苔,脉细数,其中医治法是
一小儿体重20kg,身长110cm,身长之中点位于脐与耻骨联合之间,腕部骨化中心出现7个,已出现第一磨牙,没开始换牙小儿腕部骨化中心共有
在“检测生物组织中的糖类、脂肪和蛋白质”的实验教学中,王老师想在学生自己进行实验前先给学生做演示实验,以展示实验现象。但在实验过程中,由于王老师在装有还原糖和蛋白质的试管里加的都是斐林试剂,导致装有蛋白质的试管实验现象不明显。有同学开始质疑:“怎么老师也不
下列诗句不能预测天气的是:
根据1931年的威斯敏斯特法,英国()。
在经历了全球范围的股市暴跌的冲击以后,T国政府宣称,它所经历的这场股市暴跌的冲击,是由于最近国内一些企业过快的非国有化造成的。以下哪项,如果事实上是可操作的,最有利于评价T国政府的上述宣称?
编写如下事件过程:PateSubFormActivate()Dimscore(1To3)AsIntegerDimiAsInteger,tAsVariantFori=3To1Step-1score(i)=2
Readthefollowingarticleandanswerquestions9-18onthenextpage.TheNewColourofBritishArmy1Itt
最新回复
(
0
)