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 atmosphe
Space is a dangerous place, not only because of meteors (流星) but also because of rays from the sun and other stars. The atmosphe
admin
2014-04-23
78
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 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.
The harm radiation has done to the Apollo crew members______.
选项
A、is insignificant
B、seems overestimated
C、is enormous
D、remains unknown
答案
D
解析
本题是一道具体细节题。问辐射对阿波罗号上的宇航员产生危害的情况。利用查阅式阅读法,我们可以在文章的第二段中找到相关内容。文章提到人能忍受辐射的量,从0.1到60雷目,也提到辐射对人体的伤害很难确定,需要很长的时间才能显现出来,阿波罗号上的宇航员身上积累了大量的辐射雷目,但还没有达到危险量的报道等,根据这些信息,我们可以确定本题的正确答案应是D“人们对辐射给阿波罗号上的宇航员带来的危害的情况仍然不清楚”。
转载请注明原文地址:https://kaotiyun.com/show/17XO777K
0
在职攻硕英语联考
相关试题推荐
Physicistsaren’toftenreprimandedforusingrisquehumorintheiracademicwritings,butin1991thatisexactlywhathappened
Becauseacirclehasnobeginningorend,theweddingringisasymbolof______love.
"Before,weweretooblacktobewhite.Now,we’retoowhitetobeblack."Hadija,oneofSouthAfrica’s3.5mColoured(mixedr
OurculturehascausedmostAmericanstoassumenotonlythatourlanguageisuniversalbutthatthegesturesweuseareunderst
Paulisan______worker,andrarelydoeswellinexaminations.Howeverheoftenrefusesourhelp.
Amistakeisrarelyatonedforbyasingleapology,howeverprofuse.
国家统计局(NBS)周五发布的《2018年全国睡觉时间使用情况调查报告》揭示了中国人平均每天的时间分配情况。这包括了他们的工作、睡觉、家务、休闲娱乐等不同活动。这项调查显示,低收入人群平均看电视的时间为每天1小时50分钟。这比中等收入人群多15分钟,比较高
WhydidBellLabsappointacommitteetoinvestigatesomeoftheclaimsmadebyitsscientists?
Theoriginalpurposeofdevelopingartificialskins,bonesandtissuesisto______.Thesentence"...changingyourfaceorim
Sequoyahwasbornabout1770inthevillageofTaskigi.HewasaCherokeeIndian,and,alongwithhisentiretribe,hewasillit
随机试题
下列关于的白血病护理,哪项是错误的()。
A.3500~4000cGyB.4500~5000cGyC.5500~6000cGyD.6500~7000cGyE.7000~7600cGy直肠耐受剂量
注册监理工程师在注册有效期满需继续执业的,应当在注册有效期届满()日前,按照规定的程序申请延续注册。
建筑施工企业负责人要定期带班检查,每月检查时间不少于其工作日的()
均质土坝土料填筑压实参数主要包括()。
下列评价指标中,属于静态评价指标的是( )。
JuliaGillard,aseducationministerandthenprimeminister,identifiedtheGonskiReportonschoolfunding,laterrenamedthe
张老师在工作中,注重以自己的高尚品格,人格魅力以及对学生的深切期望和真诚的爱来触动、感化学生,促使学生思想转变,这种德育方法是()。
人工经济林采用分层结构,主要目的是()。
Oneofthequestionscomingintofocusaswefacegrowingscarcityofresourcesintheworldishowtodividelimitedresources
最新回复
(
0
)