首页
登录
职称英语
Space is a dangerous place, not only because of meteors(流星)but also because of r
Space is a dangerous place, not only because of meteors(流星)but also because of r
游客
2023-07-18
55
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.【C9】______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 "rem(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 two milligrams; it【C17】______according to where you live, and this is a very rough estimate. Scientists have reason to think【C18】______a man can【C19】______far more radiation【C20】______without being damaged; the figure of 60 rems has been agreed. [br] 【C14】
选项
A、pieces
B、units
C、parts
D、elements
答案
B
解析
unit“单位、单元”;element“元素”;part“部分”:piece“碎片”。本句意为:射线的多少可以雷目这个测量单位测量。
转载请注明原文地址:https://tihaiku.com/zcyy/2848302.html
相关试题推荐
Thesebirdsare______becausetheyaretheonlyonesinthisregionwiththist
Becauseofhispoorhealth,ittookhimalongtimetothrow______hisbadcold.
Thepolicearrestedthewrongmanmainlybecausethey______thenamestheyhad
Ithinksheis______enoughtounderstandmygesturesbecauseshenoddedatme
Susanissick,butshewillbeabletogototheChristmaspartybecauseherill
Hefailedhisexam,andit______himrightbecausehehadnotstudiedforthew
Becauseofairpollution,moreandmorepeople______liveinthecountry______
Shewaslateyesterdaybecausethereartirewas______byanailandwentflat
Someofusfinditdifficulttothinkinimaginativeandflexiblewaysbecauseo
Thevisitorwas______entranceintothemuseumbecausehehadnoIDpaper.A、den
随机试题
TheUnitedNationswasfoundedtopromotepeace,prosperityandhumanrights.
Whatshouldwedofirstwhenwedecidetobuyacarat"Autoweb.com"?Yous
[originaltext]Caroleisateenagegirl.Shethinkssheisabittoofat,or
ThePresidentexplainedthatthepurposeoftaxationwasto______governmentspen
Transplantsurgeonsworkmiracles.Theytakeorgansfromonebodyandintegr
(2015年)下列情形中,属于委托方在代理期限内可以单方终止代理行为的是( )。
贷款的宽限期是指( )。A.从贷款提款完毕之日开始,或最后一次提款之日开始,至
结构化面试要求面试考官( )。A.了解组织状况和岗位要求 B.有丰富的社会工
(2017年真题)根据《药品经营质量管理规范》对人工作业库房储存药品的色标管理规
在模板设计时,作用在有效高度内的倾倒混凝土所产生的水平动力荷载取决于向模板内供料
最新回复
(
0
)