首页
登录
职称英语
[originaltext] Space is a dangerous place because of rays from the sun and ot
[originaltext] Space is a dangerous place because of rays from the sun and ot
游客
2024-03-04
65
管理
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、It protects man against the harmful rays from space.
B、It provides sufficient light for plant growth.
C、It supplies the heat necessary for human survival
D、It screens off the falling objects from space .
答案
A
解析
Why is the atmosphere essential to man?
由选项推测本题与it的功能和作用有关。文中关键词为“protective blanket”,意思是大气层像一张保护毯,故正确答案为A)。
转载请注明原文地址:https://tihaiku.com/zcyy/3504309.html
相关试题推荐
Mostofusexperiencefalsealarmswithphones,becauseitisacommonandu
Mostofusexperiencefalsealarmswithphones,becauseitisacommonandu
[originaltext]WelcometotheEdgeClimbingCentre.I’mJasonWhite,manager
[originaltext]Hello,everyone.Todaywearegoingtotalkaboutsomegenera
[originaltext]Hello,everyone.Todaywearegoingtotalkaboutsomegenera
[originaltext]TodayI’dliketotalkaboutthenewspapersintheUnitedKin
[originaltext]TodayI’dliketotalkaboutthenewspapersintheUnitedKin
[originaltext]TheBritishcelebratemanyreligious,historical,socialand
[originaltext]TheBritishcelebratemanyreligious,historical,socialand
[originaltext]Welcome,everybody,totheguideforthePeakDistrict.Situa
随机试题
Whatkindofmoviedobothspeakerslike?[originaltext]Woman:Ireallydon’twa
[originaltext]Oneofthegreatestheartbreaksforfirefightersoccurswhen
[originaltext]M:I’mgoingtoBostonnextweekandI’dliketomakesomereserv
Onwhichdayoftheweekaretheyhavingtheconversation?[br][originaltext]W
以镇心安神,清热养血为主要功用的方剂是A、归脾汤 B、酸枣仁汤 C、天王补心
各种运输方式内外部的各个方面的构成和联系,就是( )。 A.运输系统
对团队成员之间的合作关系有积极建设作用的是()较高的人。A.成就需要 B.权
Questionsrefertothefollowingletter
某施工单位承接了一项移动通信基站设备安装和直埋线路工程,开工前,施工单位根据内部
某铁矿位于甲省乙市丙县境内,是甲省属企业。依据《职业病防治法》的规定,该公司应向
最新回复
(
0
)