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
2023-07-16
67
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/2842527.html
相关试题推荐
Itwas____________(因为天气太糟糕,我们才没有和他们联系上).becausetheweatherwastoobadthat
Itissensibleforhimtoactasifheweremadinthecourt,becauseinthatca
[originaltext]ThetragedyofTitanicwillalwaysberemembered,becauseshe
A、BecauseheisfromGermany.B、BecausethecompanywasestablishedbyaGerman.
Smokingisconsidereddangeroustothehealth.Ourtobacco-seller,Mr.Johns
Smokingisconsidereddangeroustothehealth.Ourtobacco-seller,Mr.Johns
Smokingisconsidereddangeroustothehealth.Ourtobacco-seller,Mr.Johns
Smokingisconsidereddangeroustothehealth.Ourtobacco-seller,Mr.Johns
Smokingisconsidereddangeroustothehealth.Ourtobacco-seller,Mr.Johns
Smokingisconsidereddangeroustothehealth.Ourtobacco-seller,Mr.Johns
随机试题
(1)Thishasbeenquiteaweekforliterarycoups.Inanalmostentirelyune
NurseHomeVisits:ABoostforLow-IncomeParents[A]Nursehome
TheBritishEmpirewasoncehometothirdofthe【M1】______worl
某果品公司急需将一批不易存放的水果从A市运到B市销售。现有四家运输公司可供选择,
含有联苯环辛烯型木脂素的药材是A.五味子B.厚朴C.补骨脂D.秦皮E.白花前胡
()确定了专业的使命和核心关怀所在,从而确立了社会工作专业本身的专业特质。A
关于国际许可协议,下列说法正确的是A.排他许可证协议要求在同一地区内,排斥除许可
蒸制的目的包括A.改变药物性能,扩大用药范围 B.减少副作用,增强疗效 C.
若水流的流线之间夹角很大或者流线曲率半径很小,这种水流称为()。A.均匀流 B
左向右分流型先天性心脏病,不包括A.动脉导管未闭 B.室间隔缺损 C.肺动脉
最新回复
(
0
)