首页
登录
职称英语
Space is a dangerous place, not only because of meteors(流星)but also because
Space is a dangerous place, not only because of meteors(流星)but also because
游客
2024-02-17
54
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] 【C17】
选项
A、shifts
B、converts
C、modifies
D、varies
答案
D
解析
词义辨析题。shift意为“移动”,convert意为“转换”,modify意为“修改”,vary意为“变化”。结合句意可知,所处地点不同,所受辐射量也不一样,所以D正确。
转载请注明原文地址:http://tihaiku.com/zcyy/3458791.html
相关试题推荐
[originaltext]W:Whydidn’tyouhaveyourphysicsclasstoday?M:Becauseonly
[originaltext]W:Whydidn’tyouhaveyourphysicsclasstoday?M:Becauseonly
[originaltext]W:Whydidn’tyouhaveyourphysicsclasstoday?M:Becauseonly
[originaltext]W:Whydidn’tyouhaveyourphysicsclasstoday?M:Becauseonly
YadinneededhundredsofpeopletohelphimbecausethepalaceofMasadawashug
YadinneededhundredsofpeopletohelphimbecausethepalaceofMasadawashug
YadinneededhundredsofpeopletohelphimbecausethepalaceofMasadawashug
YadinneededhundredsofpeopletohelphimbecausethepalaceofMasadawashug
Becauseshewas______thatshefailedtheexam,shewouldnotcomehome.A、regre
Thereisnopoint______inthedangerousplaceifyoucan’tdoanything______th
随机试题
Thefinancialanalysisprojecthastobefinishedby[br][originaltext]M:We’v
求向量组的秩和一个极大线性无关组,并把其余向量用此极大线性无关组线性表示。
发布信息,部门必须登记,方可发布。
港珠澳大桥是世界最长的跨海大桥。读港珠澳大桥示意图,回答下题。 港珠澳
关于三羧酸循环,下列哪项是错误的?( )A.是糖、脂肪及蛋白质分解的最终途径
(2021年真题)关于理财师的工作流程,下列说法错误的是().A.理财师应
微弱、持久而具有弥漫性特点的情绪体验状态,通常叫()。A:应激B:情感C:激
税法的解释中,不可以作为判案依据的是()。A.立法解释 B.司法解释 C.
下列关于国际结算的业务特点的说法中,错误的是()A.需按照国际法规和国际惯例
在工程网络计划中,关键工作是()的工作。A.总时差最小 B.关键线路上 C
最新回复
(
0
)