首页
登录
职称英语
Space is a dangerous place, not only because of meteors(流星)but also because
Space is a dangerous place, not only because of meteors(流星)but also because
游客
2023-08-29
48
管理
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【B1】______ again acts as our protective blanket on earth. Light gets through, and this is【B2】______ for plants to make the food which we eat. Heat, too, makes our environment【B3】______. Various kinds of rays come through the air from outer space, but enormous quantities of radiation from the sun are【B4】______ off. As soon as men leave the atmosphere they are exposed to this【B5】______ and their spacesuits or the walls of their spacecraft, if they are inside, do【B6】______ a lot of radiation damage.
Radiation is the greatest known danger to【B7】______ 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 【B8】______ difficult to be sure about radiation damage—【B9】______, 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 rems.【B10】______,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,【B11】______ [br] 【B5】
选项
答案
radiation
解析
前文说到大气层隔开了大量的太阳辐射,那么当人去到外太空,自然就会暴露在这些辐射当中。radiation在前句中就已出现,听到后照抄过来就行了。
转载请注明原文地址:http://tihaiku.com/zcyy/2968465.html
相关试题推荐
BecauseSouthAfricansaregenerallysobubbly(热情奔放的)andtalkative,silenc
BecauseSouthAfricansaregenerallysobubbly(热情奔放的)andtalkative,silenc
BecauseSouthAfricansaregenerallysobubbly(热情奔放的)andtalkative,silenc
BecauseSouthAfricansaregenerallysobubbly(热情奔放的)andtalkative,silenc
BecauseSouthAfricansaregenerallysobubbly(热情奔放的)andtalkative,silenc
Jeandidnothavetimetogototheconcertlastnightbecauseshewas______(忙
Roadcourtesyisgoodsensebecause______.[br]Accordingtotheauthor,______
Roadcourtesyisgoodsensebecause______.[br]Anexampleofmisplacedmanners
__________________(我来晚了不是因为交通堵塞),butbecausetherewassomethingwrongwiththe
ItriedtorelaxbecauseIknewIwoulduseupmyoxygensooner____________(我越是激
随机试题
Youwillhearatalkbetweenayoungemployeeandaseniorcashierofafirm.
[originaltext]W:[1]Hi,Lewis.It’sJacintahere.M:[1]Oh,hi,Jacinta.Iwas
Theyhopetoseeyouagain______.A、beforelongB、longbeforeC、longagoD、after
[originaltext]M:Icouldn’tputupwithmywifeanylonger.Idon’tknowwhysh
在呼吸链中,既可作为NADH脱氢酶的受氢体又可作为琥珀酸脱氢酶受氢体是( )。
某高速公路开展竣工验收工作,为了对工程质量进行鉴定,开展试验检测工作,请根据相关
苏格拉底在受审时申辩说:“打一个可笑的比喻,我就像一只牛虻,整天到处叮住你们不放
法人机构应每年至少组织开展()次绩效考评专项审计。A.1 B.2
Thechangeinthatvillagewasmiraculou
对某民用建筑的室内消火栓进行检查,下列检查结果中不符合规范要求的有()。A.室
最新回复
(
0
)