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
2012-07-17
52
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 best title for this passage would be______.
选项
A、The Atmosphere and Our Environment
B、Research on Radiation
C、Effects of Space Radiation
D、Importance of Protection Against Radiation
答案
C
解析
本题问这篇文章的最佳标题是什么。通读全文内容,抓住文章的主旨,我们就可找出本题的正确答案C。文章虽然谈及“大气层”、“环境”、“辐射”、“防护辐射”等,但都不是文章谈论的主旨。文章开宗明义地谈及太空之所以危险主要是辐射,接着谈论人离开大气层就会受到辐射的危害,再接下来谈论造成危害的辐射量和辐射危害在短期内难以察觉,最后提到药物可以减轻辐射危害,但真正有效的药物还没有发现。因此不难看出文章主要谈论的是太空辐射的影响。因此,本题的正确答案应是C。
转载请注明原文地址:https://kaotiyun.com/show/i6XO777K
0
在职攻硕英语联考
相关试题推荐
IntheUnitedStatesandinmanyothercountriesaroundtheworld,therearefourmainwaysforpeopletobe【C1】______aboutdeve
IntheUnitedStatesandinmanyothercountriesaroundtheworld,therearefourmainwaysforpeopletobe【C1】______aboutdeve
Edisonis______theinventionofthephotograph.
Cultureisactivityofthought,andreceptivenesstobeautyandhumanefeeling.【C1】______ofinformationhavenothingtodowith
Ithinkyoucantakea(n)______languagecoursetoimproveyourEnglish.
AbudgetapprovedbytheEuropeanParliamentfortheEuropeanEconomicCommunitywasdeclaredadoptedTuesdaydespiteopposition
Historically,thespread,prevalence,andveryexistenceofcontagiousdiseasehavewhollydependedonthegrowthandconcentrat
Sincethe1980s,increasingly______toolshavemadeitpossibletoproduce,market,anddistributemotionpicturesdigitally.
TheBuddhistreligiondevelopedfromtheteachingsofShakyamuniBuddha,wholivedfromabout563to483BCEinthepresent-day
Mostepisodesofabsent-mindedness—forgettingwhereyouleftsomethingorwonderingwhyyoujustenteredaroom—arecausedb
随机试题
在静电喷涂生产线中,工件必须接地,除工件外,通常还需对()部位重点检查其接地情况。
某患者戴可摘局部义齿后出现食物嵌塞,其原因不会是
关于彩色多普勒血流成像下述哪一种性能是正确的
A.钙拮抗剂B.α-受体阻滞剂C.β-受体阻滞剂D.利尿剂(主要影响血容量)E.血管紧张素转化酶抑制剂(ACEI)首选用于治疗高血压病伴心率过快的药物是
城市热力管道焊接质量检验有()。
隧道洞口受塌方、落石、泥石流、滑坡、雪害等危害时,通常应设置()。
根据企业破产法律制度的规定,在债权人会议上,()经表决不能通过的,由人民法院裁定。
张老伯由于退休后的适应问题接受了老年社会工作者李宏提供的个案服务,到了结案期,张老伯总是挑剔李宏,对李宏表示不满意,李宏判断张老伯是对即将到来的结案产生了一种负而反应,即( )。
A、Towatchthejewelrystorerobbery.B、Tobuysomevaluablejewelry.C、Tocollectmaterialsforherstory.D、Totakesomephoto
Thenewdirectorisquitereserved.Never______(我从未见他和手下员工进行私下交谈).
最新回复
(
0
)