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
9
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] 【C1】
选项
A、as
B、in
C、on
D、to
答案
A
解析
考查介词的作用。acts as意为“充当,起……的作用”,符合句意,故选A。C较具干扰性,act on意为“对……起作用”,后接被作用的对象,用在这里上下文的意思则变为“大气层对保护毯起作用”,句意不通;act to“对待”不符合句意,可排除。
转载请注明原文地址:https://tihaiku.com/zcyy/3745401.html
相关试题推荐
Mostenvironmentalproblemsexistbecauseadequatemeasuresforpreventingthem_
Businessbuyersareconsideredthemostvulnerableconsumersbecausethey______
Iexpecttheorangejuice______undrinkablebecauseithasbeenputtherefors
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
长城theGreatWall
[originaltext]WhenIraqitroopsblewuphundredsofKuwaitioilwellsatth
下列关于加(贮)热设备的布置,哪几项不正确?()A.空气源热泵机组的风机噪声
抗甲状腺药治疗分为3个阶段,一般情况下,维持阶段约()A:6月~9月 B:9
脑外伤后感染的致病菌中,不包括A.链球菌 B.葡萄球菌 C.铜绿假单胞菌
下列连续梁(T构)的合龙、体系转换和支座反力调整的规定,符合规范的有()。A、
某黄酮类化合物紫外光谱有两个吸收带,带Ⅰ在312nm,带Ⅱ在276nm,带Ⅱ强度
患儿,7个月。因重症肺炎入院,在治疗中突然烦躁不安,呼吸困难加重,呼吸60次/分
干式站用(接地)变分接开关接触电阻值验数据超标,可短期维持运行属于(____)缺
母线差动保护各支路电流互感器变比差不宜大于()倍。(A)6(B)2
最新回复
(
0
)