首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Space is a dangerous place, not only because of meteors(流星)but also because of rays from the sun and other stars. The【B1】_____ a
Space is a dangerous place, not only because of meteors(流星)but also because of rays from the sun and other stars. The【B1】_____ a
admin
2013-05-12
39
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【B1】_____ again acts as our protective blanket on earth Light gets through, and this is【B2】_____ for plants to make the food which we eat. Heat, too, makes our environment【B3】_____. Various kinds of rays come through the air from outer space, but enormous quantities of radiation from the sun are【B4】_____ off. As soon as men leave the atmosphere they are exposed to this【B5】_____ and their spacesuits or the walls of their spacecraft, if they are inside, do【B6】_____ a lot of radiation damage.
Radiation is the greatest known danger to【B7】_____ in space. The unit of radiation is called "rem". Scientists have reason to think that a man can put up with far more radiation than 0.1 rem without being damaged; the figure of 60 rems has been agreed on. The trouble is that it is【B8】_____ difficult to be sure about radiation damage—【B9】______, and this will not be discovered until the birth of deformed children or even grandchildren. Missions of the Apollo flights have had to cross belts of high amounts of rems.【B10】______, we simply do not know yet how men are going to get on, when they spend weeks and months outside the protection of the atmosphere, working in a space laboratory. Drugs might help to decrease the damage done by radiation,【B11】______
【B4】
选项
答案
screened
解析
转载请注明原文地址:https://kaotiyun.com/show/RAB7777K
0
大学英语六级
相关试题推荐
InorOut?Britishfurthereducationcollegesdidnottraditionallyhaveanyconcernsaboutstudentdropout,becausetheori
A、Math.B、Sport.C、Chemistry.D、Biology.C对话中男士提到,虽然Allen也教数学,并且是一个优秀的橄榄球教练,但他的主科目是科学,其中尤以化学为主,虽然也教过生物。由此可见,化学是他的主科目。故答案为C)。
Peoplewithdisabilitiescomprisealargepartofthepopulation.Itis【C1】______thatover35millionAmericanshavephysical,【C
Musicproducesprofoundandlastingchangesinthebrain.Schoolsshouldaddmusicclasses,notcutthem.Nearly20yearsago,a
Musicproducesprofoundandlastingchangesinthebrain.Schoolsshouldaddmusicclasses,notcutthem.Nearly20yearsago,a
A、Thebodyneedssometimetoresponse.B、Eatingslowlycanmakeusseempolite.C、Moreenergycanbegainedifweeatslowly.D
I’drather__________________________(你坚持自已的原则).Youdon’thavetoalwaysagreewiththeauthority.
A、Becauseheisthirsty.B、Becausehelovesdrinking.C、Becauseitisgoodmanners.D、Becausehehasnothadenough.CWhydoesa
Kunzgaveupsoftwareengineeringmainlybecauseheearnedlessthanthoseinlaworbusinessfielddid.Americans’shortcoming
A、MarkprobablyoftengivesmoneytoMary.B、Mark’sfriendsandMary’sfriendshardlyspeaktoeachotherwhentheyaretogether
随机试题
刑仁讲让,示民有常。
下列关于胆汁的描述,哪些是正确的()(1997年)
严重肝、肾功能不良患者,应用糖皮质激素全身治疗时应选用
七情致病最易损伤哪几脏
初孕妇,妊娠39周,剧烈持续腹痛4小时入院。贫血貌,BP125/80mmHg,P126次/分,子宫硬,不松弛,有局限性压痛,胎位不清,胎心110次/分,阴道少量流血,肛查宫口未开。为明确诊断,最有价值的辅助检查是()
在工程项目人力资源管理的特点中,()与工程项目的内容密切相关。
对秘书工作而言,沟通协调工作的内容极为广泛,其中不属于业务工作协调内容的是()。
已知3阶矩阵A的第一行是(a,b,c),a,b,c不全为零,矩阵B=(k为常数),且AB=O,求线性方程组Ax=0的通解.
Theirpreoccupationwitheverydayroutines______themunawareofthetalkingcomputer’sstrangebehavior.
Whichtypeofwildlifebenefitsmostfromurbangardens?
最新回复
(
0
)