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
31
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
ItisincongruousthatthenumberofBritishinstitutionsofferingMBAcoursesshouldhavegrownby254percentduringaperiod
ItisincongruousthatthenumberofBritishinstitutionsofferingMBAcoursesshouldhavegrownby254percentduringaperiod
ItisincongruousthatthenumberofBritishinstitutionsofferingMBAcoursesshouldhavegrownby254percentduringaperiod
Anewstudysuggeststhatcontrarytomostsurveys,peopleareactuallymorestressedathomethanatwork.Researchersmeasured
Asa______actor,hecanperform,sing,danceandplayseveralkindsofmusicalinstruments.
______theheattoasimmerandcontinuetocookforanother8~10minutesoruntilmostofthewaterhasevaporated.
Whatwillmanbelikeinthefuture—in5,000oreven50,000yearsfromnow?Wecanonlymakeaguess,ofcourse,butwecanbes
Duringmysecondyearatthecitycollege,Iwastoldthattheeducationdepartmentwasofferinga“free”course,calledThinkin
IcametoIndiaayearagotofindavillageinwhichIcouldliveandwritebutitwasmanymonthsbeforeIsettleddownhappil
Artificialflowersareusedforscientificaswellasfordecorativepurposes.Theyaremadefrom【C1】______ofmaterials,suchas
随机试题
下列选项中,不是我国央行用狭义货币供应量表示符号的为()。
甲向乙购买一批货物,合同约定丙为鉴定人,丁为担保人,关于该合同印花税纳税人的下列表述中,正确的是()。(2012年)
导致湿地破坏的主要原因是()。
关于垃圾分类处理,下列说法错误的是()。
非指导性教学属于()
舌神经阻滞麻醉可麻醉的部位是()。
设四元齐次线性方程组求:(1)与(2)的公共解。
Inrecentdays,AmericanAirlineshasbeenforcedtocancelmorethan40flightsinPhoenix.Thereason:Withdaytimehighshove
书写查询条件时,日期值应该用()括起来。
ItispossibleforsomestudentsinHigherEducationinBritaintoborrowmoneythroughagovernmentscheme.Theseloansarecal
最新回复
(
0
)