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
A、Exposure to even tiny amounts of radiation is fatal. B、The effect of exposure to radiation is slow in coming. C、Radiation is a
A、Exposure to even tiny amounts of radiation is fatal. B、The effect of exposure to radiation is slow in coming. C、Radiation is a
admin
2009-09-12
58
问题
Space is a dangerous place 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, ff they are inside, do prevent a lot of radiation damage. Radiation is the greatest known danger to explorers in space. 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 journey, the Apollo crew accumulated a large amount of rems, the unit of radiation. 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.
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 spacesuits needn’t worry about radiation damage.
答案
B
解析
[听力原文]
What do we know about radiation in space?
由选项推测本题与辐射有关。文中关键句为“it is extremely difficult to be sure about radiation damage”,之后作者又举了例子,说明辐射给孕妇造成的影响直到畸形婴儿出生才能显现,说明这种影响是缓慢的,故正确答案为B)。其余说法均不严密。
转载请注明原文地址:https://kaotiyun.com/show/2T37777K
0
大学英语四级
相关试题推荐
Springisarrivingearlierincities.Whyisthis?Arecentstudyproposedaculprit(元凶):lightpollution,akey【C1】________be
OnJan.11,1964,Dr.LutherTerry,theU.S.surgeongeneraloftheU.S.PublicHealthService,releasedTheSurgeonGeneral’sr
TooMuchHealthcareA)ForpeoplewhohadbeenawaitingtherolloutoftheAffordableCareActinordertoobtainhealthins
TheAmazonMysteryA)Ifthere’sasentencethatsumsupAmazon,theweirdestmajortechnologycompanyinAmerica,it’sone
A、Howtheteamisbuilttokeepimprovingitsperformance.B、Whattypeofpersonneltheteamshouldbecomposedof.C、Howthete
A、Someofhisfriendslostalmosteverythingtoafinancialfraud.B、Hehimselflostalmosteverythingtoafinancialfraud.C、S
A、Studyfashiondesignatcollege.B、Improvehermarketingstrategy.C、Adddesignsforwomen.D、Expandherbusiness.D细节推断题。男士问女
A、Itneedsnegotiationforbetterconditions.B、Itrequiresatleastathree-yearsuspension.C、Itcanbecomesimilartohumant
Electronictrash,knownase-waste,ispilingupfasterthaneverinAmericanhomesandbusinesses.Peopledonotknowwhattod
Whatdoestheauthormeanbysaying"the21stcenturyequivalentofbeingcaughtnaked"(Lines3-4,Paragraph2)?Whydo
随机试题
超声多普勒孕晚期S/D正常比值是多少:
增值税纳税人提供加工、修理修配劳务的,税率为()。
不锈钢管固定时,不应与______直接接触。()
成本按经济用途分类,反映企业在一定时期内发生了哪些生产经营耗费,数额各是多少,用以分析企业耗费的结构和水平。()
直航附加费是指承运人应托运人之请求将所托运货物从装货港装船后,不经过转船而直接运抵航线上某一基本港时所增收的附加费。()
班集体形成过程分为三个阶段:()、前班集体阶段、班集体阶段。
下列哪种情况不属于外来物种入侵?()
盒子里装着分别写有1,2,3,…,134,135的红色卡片各一张,从盒中任意摸出若干张卡片,并算出这若干张卡片上各数的和除以17的余数,再把这个余数写在另一张黄色的卡片上放回盒内,经过若干次这样的操作后,盒内还剩下两张红色卡片和一张黄色卡片,已知这两张红色
Theman’sfirstjobwasin
A、Sortouttheirtaxreturns.B、Helpthemtidyupthehouse.C、Figureoutawaytoavoidtaxes.D、Helpthemtodecodeamessage.
最新回复
(
0
)