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
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(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] 【C16】
选项
A、conventional
B、common
C、general
D、normal
答案
D
解析
词义辨析题。conventional意为“传统的”,common意为“共同的,普通的”,general意为“一般的,总体的”,normal意为“正常的”。本句意为“我们每年接受的.______辐射量…”,只有normal符合句意,所以D正确。
转载请注明原文地址:https://tihaiku.com/zcyy/3458790.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
______(原本定于上周四举行的运动会)wasfinallycanceledbecauseofthebadweather.Thesports
[originaltext](32)Manyanimalsrecognizetheirfoodbecausetheyseeit.So
[originaltext](32)Manyanimalsrecognizetheirfoodbecausetheyseeit.So
[originaltext](32)Manyanimalsrecognizetheirfoodbecausetheyseeit.So
[originaltext](32)Manyanimalsrecognizetheirfoodbecausetheyseeit.So
Becausesomanypeopleintheirteensandearly20sareincreasinglysociali
Becausesomanypeopleintheirteensandearly20sareincreasinglysociali
随机试题
FormanyyearsafterheformedhisTheoryofRelativity,AlbertEinsteinvis
Ⅰ.Whatisaresearchproposal?1)intendedtoconvinceothersthat
TheplaywrightDavidHenryHwanghasbeeninhighdemandinrecentyears—not
非空的循环单链表head的尾结点P满足的条件是()。A.P.link=head
增加左心前负荷的是:A.高血压 B.主动脉瓣狭窄 C.肺动脉高压 D
176、线路两侧或主设备差动保护各侧的电流互感器的相关特性宜一致,避免在遇到较大
下列对于本公文的附件及成文日期的叙述,错误的是:() A.附件说明位置错误
潘某丈夫早年去世,生有二子一女,分别为潘甲、潘乙和潘丙。潘乙于2000年5月起与
长程心理咨询的时间一般是()以上。 (A)1个月(B)2个月(C)3个月(D
某生产企业为增值税一般纳税人,有出口经营权,该企业出口的下列货物,适用增值税免税
最新回复
(
0
)