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
30
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
Formanypeople,overeatingandoverspendingareas______toChristmasascandlesandholly.
Anewstudysuggeststhatcontrarytomostsurveys,peopleareactuallymorestressedathomethanatwork.Researchersmeasured
ThehistoryofresponsestotheworkoftheartistSandroBotticelli(1444—1510)suggeststhatwidespreadappreciationbycritics
Asa______actor,hecanperform,sing,danceandplayseveralkindsofmusicalinstruments.
SomescientistsaretryingtoeliminatemalariabydevelopingaGMmosquitothatcan’ttransmitthedisease.
Hewasbroughttoconsciousnesswhenthedoctorhad_____artificialrespiration.
Sequoyahwasbornabout1770inthevillageofTaskigi.HewasaCherokeeIndian,and,alongwithhisentiretribe,hewasillit
Sincethelate1930’stheBureauofIndianAffairsoftheUnitedStateshasbeenworkingtopromotenativelanguageliteracyamo
随机试题
患者两个月来关节肿大窜痛,屈伸不利,恶风怕冷,虽经治疗,症无改善,又增关节局部灼热,口干便燥,脉滑稍数,舌苔薄黄,主方选用()(1999年第67题)
根据行政诉讼法规定,当事人的申请符合下列情形之一的,人民法院应当再审:()
简述教育研究基本过程的步骤。
A.不伤害原则B.有利原则C.尊重原则D.公正原则E.自主原则哪项原则体现医生在诊治过程中不使患者的心身等受到损害
男,58岁,因2天前突然严重头痛,恶心,呕吐,伴有颈项强直而入院。穿刺检查证明脑压增高,除一般治疗外,为防治脑血管痉挛,宜选用()
甲企业为危险化学品生产经营单位,2017年6月与乙企业签订了工厂机械、管道类检修维护服务合同,双方约定,乙企业为甲企业的位于某县化学工业园区内的乙烯裂解综合装置中相关工厂提供机械、管道类日常维护修理服务。该合同所包含的健康安全环境条款规定,乙企业为甲企业的
在信用条件为“2/10,n/30”时,如果企业不取得现金折扣,在第30天付清货款,则其机会成本为()。
甲公司是一家光伏发电企业。受技术、经济等多种因素影响。光伏发电投资成本居高不下,而同一区域的风力发电企业成本较低,给甲公司的生存和发展带来威胁。更糟糕的是,公司在新建光伏电站时,因不了解当地的实际情况,选址不当,造成运输成本过高,并且破坏生态环境。甲公司面
Thisbookprovidesyouwiththesimplebasicsforbeingphysicallyfit.【21】______yourageorpresentstateoffitness,you
Youcan’tbuyhappiness.However,itlooks(1)______youcanatleastinheritit,BritishandAustralianresearcherssaid.As
最新回复
(
0
)