首页
登录
职称英语
Space is a dangerous place, not only because of meteors (流星) but also becaus
Space is a dangerous place, not only because of meteors (流星) but also becaus
游客
2024-09-05
22
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 atmosphere again acts 【C1】_____ our protective blanket on earth. Light gets through, and this is 【C2】_____ for plants to make the food 【C3】_____ we eat. Heat, too, makes our environment endurable. Various kinds of rays 【C4】_____ the air from outer space, 【C5】_____ enormous quantities of radiation from the sun are 【C6】_____ off. As soon as men leave the atmosphere they are 【C7】_____to this radiation but their spacesuits or the walls of their spacecraft, 【C8】_____ they are inside, do prevent a lot of radiation damage.
Radiation is the greatest known 【C9】_____ to explorers in space. The unit of radiation is called "rem (雷姆)". Scientists have reason to think that a man can 【C10】_____ far more radiation 【C11】_____ 0.1 rem without being damaged; the figure of 60 rems has been agreed on. The trouble is that it is extremely 【C12】_____ to be sure about radiation damage—a person may feel perfectly well, but the 【C13】_____ of his or her sex organs may be damaged, and this will not be discovered 【C14】_____ the birth of deformed children or even grandchildren.
Missions of the Apollo flights have had to cross belts of high amount of rems. So far, no dangerous amounts of radiation have been 【C15】_____, but the Apollo missions have been quite 【C16】_____. We simply do not know yet how men are going to get on when they 【C17】_____ weeks and months outside the 【C18】_____ of the atmosphere, working in a space laboratory. Drugs might help to 【C19】_____ the damage done by radiation, but no really 【C20】_____ ones have been found so far. [br] 【C14】
选项
A、till
B、until
C、unless
D、during
答案
B
解析
考查介词的固定搭配。not...until意为“直到……才”,符合句意,故选B。
转载请注明原文地址:https://tihaiku.com/zcyy/3745414.html
相关试题推荐
Myunclecan’tget_____becausehehasrheumatism(风湿病).A、aboutB、onC、through
Ididn’tsleepwellbecausethetapinthebathroomwas______.A、drainingB、drop
Spaceisadangerousplace,notonlybecauseofmeteors(流星)butalsobecaus
Spaceisadangerousplace,notonlybecauseofmeteors(流星)butalsobecaus
Spaceisadangerousplace,notonlybecauseofmeteors(流星)butalsobecaus
Spaceisadangerousplace,notonlybecauseofmeteors(流星)butalsobecaus
Spaceisadangerousplace,notonlybecauseofmeteors(流星)butalsobecaus
Spaceisadangerousplace,notonlybecauseofmeteors(流星)butalsobecaus
Spaceisadangerousplace,notonlybecauseofmeteors(流星)butalsobecaus
Spaceisadangerousplace,notonlybecauseofmeteors(流星)butalsobecaus
随机试题
Thecurseofjetlaghasstruckmostinternationaltravelersatonetimeor
[originaltext]Tosomeit’sadreamjob—eatingdeliciousmealsforfreeand
WhetheryouarehikingthroughthemagnificentredwoodsofNorthernCaliforni
WhathashappenedsincetheandoftheIceAge?[br][originaltext]Ifthe
Ifhospitalshavepracticaldifficulties,theycantemporarilyisolatesuspected
下列关于证券经纪业务的说法错误的是()。A.证券经纪业务,是指在证券交易中,
国际上经常使用的反收购策略主要有()。A:事先预防策略 B:管理层防卫策略
根据公司法律制度的规定,下列选项中,属于公司注册资本减少程序的是()。A.
在Ⅱ类精密进近灯光系统中,接地带灯的最大倒闸时间为( )。A.0.5s B.
机体处于应激如创伤、手术、感染等情况下,能量代谢的变化中错误的是A:机体出现高代
最新回复
(
0
)