首页
登录
职称英语
Space is a dangerous place, not only because of meteors but also because of
Space is a dangerous place, not only because of meteors but also because of
游客
2023-11-22
44
管理
问题
Space is a dangerous place, not only because of meteors 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 space suits 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 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. [br] 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
细节理解题。本题询问的是太空辐射对Apollo号宇航员造成的伤害情况。文章第二段第六句“So far,no dangerous amounts of radiation have been reported,”说明太空辐射对这些宇航员所造成的伤害目前还不知晓。因此,D选项为正确答案。A项指出Apollo号宇航员所受的辐射微不足道,B项说辐射看来是被夸大了,C项说辐射非常严重,这些都未在文中提到。
转载请注明原文地址:https://tihaiku.com/zcyy/3209283.html
相关试题推荐
Spaceisadangerousplace,notonlybecauseofmeteorsbutalsobecauseof
Spaceisadangerousplace,notonlybecauseofmeteorsbutalsobecauseof
Spaceisadangerousplace,notonlybecauseofmeteorsbutalsobecauseof
Becauseofthebadfoodhehadeaten,hisstomachbeganto________.A、painB、be
Becauseofthecomplexityofthemodernmachine,mostofficesrequiresecretarie
Everyonemusthavelikedthecakebecausetherewasn’tevena_________left.A、c
Becausehewas______ofthenewlimit,hewasstoppedandwarnedforspeeding.A
Hiswifedivorcedhimbecausehewasaddicted______.A、togambleB、gamblingC、to
AccordingtoMr.Bacon,peoplekeepsnakesbecause______.[br][originaltext]W
Thepoemisdifficulttounderstandbecauseitcontainssomany______reference
随机试题
Yetwitheconomiesinfreefall,managersalsoneedup-to-dateinformationa
ExerciseIsGoodforYourBodyandYour
按照《证券公司合规管理实施指引》的要求,证券公司的合规管理是指证券公司制定和执行
《隔离开关分合闸位置“双确认”改造技术规范》中视频联动系统技术参数报警切换响应时
关于对上市客户法人治理结构的分析,下列说法中正确的是()。A.信贷人员应对其股
合理用药的基本原则中,放在首位的是A.药物的疗效 B.药物的安全 C.药物的
(2019年真题)下列各项中,导致企业固定资产账面价值减少的事项有( )。
投资项目决策分析与评价的基本要求包括贯彻落实科学发展观、资料数据准确可靠和()
三等数字水准测量观测顺序正确的是()A.后→前→后→前 B.后→前→前→
关于沟通下列说法正确的是()。A.沟通过程包括沟通主体、沟通介体、沟通环境和沟通
最新回复
(
0
)