首页
登录
职称英语
Space is a dangerous place, not only because of meteors (流星) but also because of
Space is a dangerous place, not only because of meteors (流星) but also because of
游客
2024-02-17
4
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 【C2】______ . Light gets through, and this is essential 【C3】______ plants to make the food which we 【C4】______ . Heat, 【C5】______ , makes our environments tolerable and some ultraviolet rays (紫外线) penetrate the 【C6】______ . Cosmic (宇宙的) rays of various kinds come 【C7】______ the air from outer space, but 【C8】______ quantities of radiation from the sun are screened off. As 【C9】______ as men leave the atmosphere they are 【C10】______ to this radiation; 【C11】______ their spacesuits or the walls of their spacecraft, if they are inside, 【C12】______ prevent a lot of radiation damage.
Radiation is the greatest known danger to explorers in 【C13】______ . Doses of radiation are measured in 【C14】______ called "rems (雷姆)". We all 【C15】______ radiation here on earth from the sun, from cosmic rays and from radioactive minerals. The" 【C16】______ "dose of radiation that we receive each year is about 100 millirems; it 【C17】______ according to where you live, and this is a very rough estimate. Scientists have reason to think 【C18】______ a man can 【C19】______ up with far more radiation
【C20】______ this without being damaged; the figure of (60) rems has been agreed. [br] 【C8】
选项
A、valid
B、enormous
C、various
D、proper
答案
B
解析
词义辨析题,valid 意为“有效的”,enormous 意为“大量的”,various 意为“各种各样的”,proper 意为“合适的”,结合句意“但 ______ 数量的来自太阳的射线被挡开了”可知,B正确
转载请注明原文地址:https://tihaiku.com/zcyy/3457370.html
相关试题推荐
Thewriter’sfirstmarriagewasunsuccessfulbecause______.[br]Thewriter’sm
Thewriter’sfirstmarriagewasunsuccessfulbecause______.[br]Whenthewrite
Allflights______becauseoftheheavyfog,wehadtodecidetotakethetrain.A
Spaceisadangerousplace,notonlybecauseofmeteors(流星)butalsobecauseofr
Spaceisadangerousplace,notonlybecauseofmeteors(流星)butalsobecauseofr
Spaceisadangerousplace,notonlybecauseofmeteors(流星)butalsobecauseofr
Spaceisadangerousplace,notonlybecauseofmeteors(流星)butalsobecauseofr
Spaceisadangerousplace,notonlybecauseofmeteors(流星)butalsobecauseofr
Spaceisadangerousplace,notonlybecauseofmeteors(流星)butalsobecauseofr
Spaceisadangerousplace,notonlybecauseofmeteors(流星)butalsobecauseofr
随机试题
Acoeducational(男女合校的)schoolOfferschildrennothinglessthanatruevers
外部效度
各力作用线在同一平面内,且力的作用线都汇交于一点的力系称()力系。A.空间汇交
为使围护结构不受潮,下列哪一项做法是错误的?()A.增大冷凝计算界面内侧材料
女性,62岁,既往有外阴色素减退性疾病史,近期外阴瘙痒症状明显加重且伴有疼痛。查
结核菌素试验阳性的意义是A.阴性反应可以除外肺结核 B.阳性表明目前有结核菌感
下列关于远期合约缺点的说法,错误的是()。A.不利于市场信息的披露 B.灵活
某房地产在用比较法估价时得出三个比准价格:820元/㎡、850元/㎡、900元/
属于通用消防设施中灭火器一般缺陷的是()(A)锈蚀严重,表面产生凹坑(B)明
假定一项投资的年利率为20%,每半年计息一次,则有效年利率为()。(答案取近似
最新回复
(
0
)