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
120
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.
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 space suits needn’t worry about radiation damage
答案
B
解析
细节理解题。根据文章第二段第四句“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 o
转载请注明原文地址:https://kaotiyun.com/show/v06K777K
0
专业英语四级
相关试题推荐
Nowadays,manypeopleturntotheInternettosolveamultitudeofmedicalquandaries,extendingeventothemattersofhowtof
AsInternethavebeenquitepopular,somearguethatpeople’sproblem-solvingabilitywilldeteriorate,becausetheyareadapted
Chinesepeoplearenolongerstrangerstofood-safetycrisis—thecontaminatedvinegar,themeatthatglowedinthedark,theexp
(1)AsIponderwhomitmightbethatIwouldconsiderarolemodel,IrealizedthattherearealotofpeopleIknowpersonally
(1)Acelebrityisawidely-recognizedorfamouspersonwhocommandsahighdegreeofpublicandmediaattention;therefore,one
(1)Acelebrityisawidely-recognizedorfamouspersonwhocommandsahighdegreeofpublicandmediaattention;therefore,one
(1)Acelebrityisawidely-recognizedorfamouspersonwhocommandsahighdegreeofpublicandmediaattention;therefore,one
A、Becausetheyarelesslikelytosuffermemoryloss.B、Becausetheytendtobemorediligentlanguagelearners.C、Becausethey
A、BecausewestilllacktheevidencetobackthatB、Becausetherehaven’tbeenenoughnegotiations.C、Becauseweallvalueourd
随机试题
电位滴定与容量滴定的根本区别在于()不同。
取某药物水溶液,加盐酸使成酸性,再加三氯化铁试液1滴,即显紫红色。放置3小时,不得发生沉淀。该药物应是
下列()人员应当向公司申报所持有的本公司的股份,并在任职期间内不得转让。
【2006年第4题】题16~19:某中学普通教室宽约10m,长约15m,高约3.5m,顶棚、墙面四白落地,水泥地面,前面讲台和后面班级板报均有黑板。请回答下列照明设计相关问题。请分析说明为使教室照度分布均匀,宜采用下列哪种规格的灯具?
下列不属于流浪乞讨人员救助领域的社会工作方法的是( )。
德育就是要用“爱”的浪花推动青少年前进的风帆,用“善”的乳汁润滑青少年生命前进的车轮,用“美”的春雨沐浴青少年飞翔的双翼,用“真”的阳光照耀青少年生命成长的大道。美好的使命自然使德育成为最有魅力的教育。我们要让青少年明白生命是美丽的,是神圣的,是伟大的,应
公文可以转变为值得信赖的历史档案,或者成为可资采信的()。
中国雅虎推出社交网站标志着该行业正迎来拐点。Facebook的出现让社区网络被人们所熟知。随着网易“梦幻人生”浮出水面,又有一家传统门户网站进入了社区网站领域。业内人士分析,门户网站拥有充足的资金,它们的加入将对传统社区网站造成不小冲击,并提升市场进入门槛
A、ThereisnoaccesstotheInternet.B、Thetrafficoutsideistoonoisy.C、Theairconditionerisoutoforder.D、Thereisnoh
Valentine’sDayissupposedtobeaboutloveandromance.Butunfortunately,itcanbejusttheopposite.Becauseofthat,Feb.
最新回复
(
0
)