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
2024-02-14
15
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 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 "rems" (雷目). 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 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】______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”,本句意思是:“射线的多少可以以雷目这个测量单位测量”。
转载请注明原文地址:https://tihaiku.com/zcyy/3451399.html
相关试题推荐
[audioFiles]audio_eufm_j75_001(20082)[/audioFiles]A、Becausethepolicemanstopp
Don’thesitatetodoitbecausewhatyoudo____________(对我没有很大关系).doesnotmak
I________(想暑假外出旅游)becauseIenjoymeetingpeopleandseeingnewplaces.feell
Skydiving,adifficultanddangeroussport,isverypopular______bothmenand
The__________oftherelieftothefloodedareawasheldupbecauseoftheincon
Itwasdifficultforhimtobuygoodshoesbecausehehadsuchabig______off
Spaceisadangerousplace,notonlybecauseofmeteors(流星)butalsobecause
Spaceisadangerousplace,notonlybecauseofmeteors(流星)butalsobecause
Spaceisadangerousplace,notonlybecauseofmeteors(流星)butalsobecause
Spaceisadangerousplace,notonlybecauseofmeteors(流星)butalsobecause
随机试题
[originaltext]InNewYorkCitypublicschools,176differentlanguagesare
用简洁的文字对被审计单位内部控制的调查结果加以叙述的方法是()。A.调查表法
组织实施医师资格考出的行政部门是()A.省级以上人民政府人力资源与社会保
沥青路面的龟裂、块状裂缝、坑槽、松散、沉陷、泛油、波浪、拥包损坏应按()计算。A
为了在两次校准或检定的间隔期间防止使用不符合技术规范要求的设备,应进行设备的(
下列化学物质中。不是植物激素的是( )。A.2.4-D B.乙烯 C.吲哚
与呼吸运动关系最密切的是A.心、肺 B.心、肝 C.肺、脾 D.肺
下列哪项不是低分子量肝素较于普通肝素的优点A.对因子Ⅹa的抑制活性减弱B.对因子
干燥的气候是森林大火的( )。 A.损失 B.风险因素 C.风
男,35岁,外伤后腰痛伴右下肢麻木1周。查体:腰部活动受限,右小腿外侧感觉减退,
最新回复
(
0
)