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
68
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】______
【B8】
选项
答案
extremely
解析
转载请注明原文地址:https://kaotiyun.com/show/PAB7777K
0
大学英语六级
相关试题推荐
Peoplewithdisabilitiescomprisealargepartofthepopulation.Itis【C1】______thatover35millionAmericanshavephysical,【C
HowtoSolveThreePuzzlesNewknowledgeandsophisticateddiagnostictechniquesarehelpingdoctorsrecognizeearlysignso
Kunzgaveupsoftwareengineeringmainlybecauseheearnedlessthanthoseinlaworbusinessfielddid.Americans’shortcoming
NewYear’sDayisthelastbankholidayofthefestiveseason.Itmeansmostpeoplehavetogotoworkthenextday:【B1】______a
A、Bringinginaguestexpertontheshow.B、Discussinghowtochangethesituation.C、Gettingfeedbackfromlistenerswhocallt
A、Tooslowforadifficultbookthoughjustrightforanon-seriousone.B、Tooslowforanon-seriousbookbuttoofastforadi
A、Therearenotenoughefficientmanagers.B、Itlacksinguidelinesfornewemployees.C、Theconferencescheduleshouldchangei
MoreAmericansaretakingupeducationafterretirementspartlybecause______.Whatcanbeinferredfromthelastparagraphab
Manyprivateinstitutionsofhighereducationaroundthecountryareindanger.Notallwillbesaved,andperhapsnotall【B1】__
Theyhaddiscusseditforfourdaysandcouldn’t____________(找到一个能切实解决问题的方案).
随机试题
大脑部位与功能对应错误的是()
在药物治疗中。临床医生应遵循的道德要求,不包括
东莨菪碱的化学结构是()。
附条件生效的合同,合同成立后虽然并未开始履行,但任何一方不得撤销要约和承诺,否则应承担()。
自2006年1月1日起,进境木质包装必须具有( )标识才能放行。
某双代号网络计划的终点节点有四条内向箭线,其最早完成时间分别为第20、25、32、41周,要求该项目在38周内完成,则其计算工期和计划工期的最大值应分别为()周。
某勘察设计院成立20多年来,创造了许多辉煌业绩。近几年来,市场竞争激烈,勘察设计院在管理和服务等方面出现了相对落后的情况,业绩逐年下降。2008年新上任的陆院长利用勘察设计院改制的机会,对勘察设计院进行了变革:首先,对组织结构进行了调整,将业务进行了重新组
某街道有四个小区。60岁以上共17608人,其中女性9608人,男性8000人。现将调查的60岁以上人群患有缺铁性贫血的情况进行统计和整理,得到的资料如表1所示。现根据上述提供的信息进行计算。并分别回答以下问题:请计算出该街道的男女相对比。
关于班级管理的概念,以下说法中正确的有【】
严肃与谨慎相结合,是我们党根据历史经验和对肃反斗争的深刻理解而提出的,是指导人民警察同刑事犯罪分子作斗争的一项重要政策。()
最新回复
(
0
)