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
Space is a dangerous place, not only because of meteors (流星) but also because of rays from the sun and other stars. The【26】again
Space is a dangerous place, not only because of meteors (流星) but also because of rays from the sun and other stars. The【26】again
admin
2011-03-01
54
问题
Space is a dangerous place, not only because of meteors (流星) but also because of rays from the sun and other stars. The【26】again acts as our protective blanket on earth. Light gets through, and this is【27】for plants to make the food which we eat. Heat, too, makes our environment【28】Various kinds of rays come through the air from outer space, but enormous quantities of radiation from the sun are【29】off. As soon as men leave the atmosphere they are exposed to this【30】and their spacesuits or the walls of their spacecraft, if they are inside, do【31】a lot of radiation damage.
Radiation is the greatest known danger to【32】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 rein without being damaged; the figure of 60 rems has been agreed on. The trouble is that it is【33】difficult to be sure about radiation damage—【34】, 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 amounts of reins.【35】, 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,【36】
Space is a dangerous place, not only because of meteors (流星) 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 and 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 rein 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 children or even grandchildren. Missions of the Apollo flights have had to cross belts of high amounts of reins. 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
答案
extremely
解析
转载请注明原文地址:https://kaotiyun.com/show/Gfo7777K
0
大学英语六级
相关试题推荐
Peoplebornintheautumnlivelongerthanthoseborninthespring.Andtheyarelesslikelytofall【B1】______illwhentheyar
America’sBrainDrainCrisisLosingtheGlobalEdgeWilliamKunzisaself-describedcomputergeek.Amoreaptdescrip
Astudyrevealsthatthebrainareasthatrespondwhenfearislearnedthroughpersonalexperienceareal-sotriggeredwhenwes
A、Becauseshefeelsveryhotintheroom.B、Becauseshewantstoavoidmeetingpeople.C、Becauseshewantstosmokeacigarette
A、Themancancomeanothertime.B、Therewouldbemorefunwithouttheman’sroommate.C、Itisnoproblemiftheman’sroommate
A、Businesssuccesstakesahighlevelofactivity.B、Topmanagersaregenerallygiftedatjudgingpeople.C、Businesssuccesstak
RisingbrightandearlyonaSaturdayusedtobeamatterofsurvivalinGermany.【C1】______the1990smostshopsclosedforthe
Mostofusaretaughttopayattentiontowhatissaid--thewords.Wordsdoprovideuswithsomeinformation,butmeaningsared
A、Somewherethatiswithinashortdrivingdistanceofcampus.B、Anapartmentwithfurniturealreadyinit.C、Aplacewhereshe
Languageisthemeansbywhichthethoughtsandfeelingsofonepersonarecarriedtoanotherpersonsothattheyareunderstood
随机试题
可触及搏动的动脉有
LosAngeleshasplanted2,000rubbertreesdownthemiddleofoneofitsmainstreets.Thesetreesdonot【C1】______rubber.They
紫雪散具有()的功效。
A、串油粉碎法B、串料粉碎法C、水飞粉碎法D、加液研磨法E、超微粉碎法处方中含有大量桃仁、酸枣仁,粉碎宜采用()
关于《“十三五”国家药品安全规划》确定的保障药品安全发展目标和主要任务的说法,错误的是
()是判断一个评估项目是否执行了基本程序的主要依据,应反映资产评估专业人员实施现场调查、评定估算等评估程序,支持评估结论。
根据《中华人民共和国劳动合同法》的规定,用人单位招用劳动者,不得扣押劳动者的居民身份证和其他证件。()
富裕起来的这一代中国父母,仍然处在家庭教育的“初级阶段”内,习惯于用物质欲望的满足、用金钱砸下的“抢跑”来帮助孩子“赢在起跑线上”,用不肯放手来表达自己对孩子的爱、对教育的重视。快乐对于单纯的孩子而言,实在是很简单的事。有爱心的父母,没有那么多期望与要求,
函数u=ln(x2+y2+z2)在点M(1,2,-2)处的梯度gradu|M=_______.
Itisreportedthatmentalhealthhasbecomeatroublesomeissue.Thenumberofpeoplecommittingsuicideisontherise.Youar
最新回复
(
0
)