首页
登录
职称英语
Space is a dangerous place, not only because of meteors(流星)but also because
Space is a dangerous place, not only because of meteors(流星)but also because
游客
2023-09-01
30
管理
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【B1】_____ again acts as our protective blanket on earth Light gets through, and this is【B2】_____ for plants to make the food which we eat. Heat, too, makes our environment【B3】_____. Various kinds of rays come through the air from outer space, but enormous quantities of radiation from the sun are【B4】_____ off. As soon as men leave the atmosphere they are exposed to this【B5】_____ and their spacesuits or the walls of their spacecraft, if they are inside, do【B6】_____ a lot of radiation damage.
Radiation is the greatest known danger to【B7】_____ 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【B8】_____ difficult to be sure about radiation damage—【B9】______, 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 amounts of rems.【B10】______, 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,【B11】______ [br] 【B7】
选项
答案
explorers
解析
转载请注明原文地址:https://tihaiku.com/zcyy/2975450.html
相关试题推荐
[originaltext]Forcenturies,parrotshavebeenprizedpetsbecauseoftheir
[originaltext]Forcenturies,parrotshavebeenprizedpetsbecauseoftheir
Becauseaheadacheisnotadisease,itwillnotcauseseriousinfluenceonour
Becauseaheadacheisnotadisease,itwillnotcauseseriousinfluenceonour
Becauseaheadacheisnotadisease,itwillnotcauseseriousinfluenceonour
Becauseaheadacheisnotadisease,itwillnotcauseseriousinfluenceonour
Becauseaheadacheisnotadisease,itwillnotcauseseriousinfluenceonour
Canyouchangeyournamejustbecauseyoudon’tlikeit?Andtheanswerapp
Canyouchangeyournamejustbecauseyoudon’tlikeit?Andtheanswerapp
Canyouchangeyournamejustbecauseyoudon’tlikeit?Andtheanswerapp
随机试题
ForeachofQuestions1to9,compareQuantityAandQuantityB,usingadditiona
Whatkinkofeffectdocalorieshaveonyourbody?[br]Yourweightwillcomeri
________heneededmoneyforanewcar,hedecidednottoborrowitfromthebank
下列景区,属于流纹岩地貌的是()。A.庐山 B.雁荡山 C.仙都峰 D.杭
妊娠期甲亢的首选治疗措施是A.放射性碘治疗 B.丙基硫氧嘧啶 C.心得安
血证的预后与下列哪一项无关A.病情的虚实 B.出血量的多少 C.脉象数急与否
与动物细胞结构比较,细菌所特有的一种重要结构是A:细胞壁 B:线粒体 C:细
据了解,最早在明朝,跪迎圣驾成了国家制度。清承明制,下跪日渐成为清朝人的“重要礼
(2018年11月)某大型国有企业2014年开始实施竞聘上岗。在竞聘过程中,一名
A. B. C. D.
最新回复
(
0
)