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
2024-10-25
10
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 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
主旨判断题。本题要求根据文章内容为文章选择一个最适合的标题。由本文判断文章谈论的是“太空辐射的后果”,因此,C选项为正确答案。A项“大气层与我们的环境”只是在文章第一段谈到,所以不能概括全文的内容。从文章的行文可以看出,文章主要谈论辐射的危害,而非对辐射的研究,因此,B项不是正确答案。D项“保护人类免受太空辐射的重要性”也只是概括了文章的部分内容,不能作为全文的主题。
转载请注明原文地址:https://tihaiku.com/zcyy/3816018.html
相关试题推荐
ItcanbeinferredthatScottwasaherobecause______.[br][originaltext]
ItcanbeinferredthatScottwasaherobecause______.[br][originaltext]
Therehasbeena______increaseofcomplaintaboutthematterbecauseofmisund
OfficialssaywaterlevelsalongtheBrahmaputraRiverstillareatdangerousle
OfficialssaywaterlevelsalongtheBrahmaputraRiverstillareatdangerousle
Spaceisadangerousplace,notonlybecauseofmeteorsbutalsobecauseof
Ourcompanydecidedto______thecontractbecauseanumberoftheconditionsin
Allflights______becauseofthesnowstorm,wedecidedtotakethetraininstead
Becauseoftheeconomicslump,thereareonly______onthebeachasbefore.A、on
Sheoughttomakeashiftnow;sheisinabadmoodbecauseshe______inthedu
随机试题
Metorology[img]2012q1/ct_etoefm_etoeflistz_0627_20121[/img][br]Whydoesthepr
InWashingtonD.C.,1600PennsylvaniaAvenueisaveryspecialaddress.It
EconomistssayconfidenceintheU.S.economyhasimprovedsincethefinanci
教育对象的人格特征有()A.主体选择性 B.客体可塑性 C.异气相求性
某住房抵押贷款估价项目,属于法定估价业务,该笔住房抵押贷款期限为20年,则为该笔
在受灾地区安置点建设初期,碰到比如安全、卫生、板房漏水等具体问题而管委会又没有能
实现从理性认识到实践的飞跃,必须要从实际出发,坚持理论和实践相结合的原则。下列成
有关金融租赁公司与融资租赁公司的区别描述正确的是()。A.中国银监会负责金融租赁
在施工过程基本组织方法中,可以科学地利用工作面,实现不同专业队之间平行施工的是(
诊断矽肺的主要依据是() A.临床症状、职业史 B.活检、职业史 C.胸片
最新回复
(
0
)