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 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
2010-01-10
43
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 space suits 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 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.
The best title for this passage would be ______.
选项
A、The Atmosphere and Our Environment
B、Research on Radiation
C、Effects of Space Radiation
D、Importance of Protection Against Radiation
答案
C
解析
主旨判断题。本题要求根据文章内容为文章选择一个最适合的标题。由本文判断文章谈论的是“太空辐射的后果”,因此,C选项为正确答案。A项“大气层与我们的环境”只是在文章第一段谈到,所以不能概括全文的内容。从文章的行文可以看出,文章主要谈论辐射的危害,而非对辐射的研究,因此,B项不是正确答案。D项“保护人类免受太空辐射的重要性”也只是概括了文章的部分内容,不能作为全文的主题。
转载请注明原文地址:https://kaotiyun.com/show/006K777K
0
专业英语四级
相关试题推荐
Loveisromantic,thisisthecommontruthbelievedbymostpeoplewhohavenotmarried.But,marriagemeansacouplebindsinto
Thereareanumberofbeautycontestsacrosstheworld,themostfamousperhapsbeingtheMissWorldPageant.Somepeoplebeliev
AsInternethavebeenquitepopular,somearguethatpeople’sproblem-solvingabilitywilldeteriorate,becausetheyareadapted
(1)AsIponderwhomitmightbethatIwouldconsiderarolemodel,IrealizedthattherearealotofpeopleIknowpersonally
(1)Acelebrityisawidely-recognizedorfamouspersonwhocommandsahighdegreeofpublicandmediaattention;therefore,one
(1)Sometimesthebiggestchangesinsocietyarethehardesttospotpreciselybecausetheyarehidinginplainsight.Itcouldw
AsInternethavebeenquitepopular,somearguethatpeople’sproblem-solvingabilitywilldeteriorate,becausetheyareadapted
A、Becauseoldpeopleknowwhentheyshouldgotothehospital.B、Becauseoldpeoplearehealthyfromtheirchildhoodtomiddlea
A、Itwasbecausethefirsttimewasn’tasuccess.B、Thissecondtimewasforherunbornbaby.C、Shewantedtosetagoodexample
随机试题
患者烦渴多饮,口干舌燥,兼见小便频多,舌边、尖红,苔薄黄,脉洪数,其治法是()
下列哪些影像诊断设备可作为介入放射学的导引设备
硬膜外麻醉时,下列影响麻醉平面的因素中哪项最不重要
A.下元虚寒B.脾肾阳虚C.病后体虚D.脾肺气虚E.肝肾阴虚
A、痰火扰心B、痰气凝结,阻蔽心神C、痰迷心窍,肝风内动D、正气已伤,病情严重,预后不好E、阴阳格拒,阴不敛阳,阳气欲脱失神的病机是()。
特别提款权的创立是()。
在债券质押式回购交易中,融资方是指在债券回购交易中融入资金、出质债券的一方。()
下列各项中,不属于承租人的初始直接费用的是()。
针对识别出的超出正常经营过程的重大关联方交易,注册会计师应当考虑的应对措施包括()。
TheNorwegianGovernmentisdoingitsbesttokeeptheoilindustryunder【B1】______Productionlimitshavebeen【B2】______down;
最新回复
(
0
)