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【26】again
Space is a dangerous place, not only because of meteors (流星) but also because of rays from the sun and other stars. The【26】again
admin
2011-03-01
46
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【26】again acts as our protective blanket on earth. Light gets through, and this is【27】for plants to make the food which we eat. Heat, too, makes our environment【28】Various kinds of rays come through the air from outer space, but enormous quantities of radiation from the sun are【29】off. As soon as men leave the atmosphere they are exposed to this【30】and their spacesuits or the walls of their spacecraft, if they are inside, do【31】a lot of radiation damage.
Radiation is the greatest known danger to【32】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 rein without being damaged; the figure of 60 rems has been agreed on. The trouble is that it is【33】difficult to be sure about radiation damage—【34】, 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 reins.【35】, 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,【36】
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 as our protective blanket on earth. Light gets through, and this is essential for plants to make the food which we eat. Heat, too, makes our environment endurable Various kinds of rays come through the air from outer space, but enormous quantities of radiation from the sun are screened off. As soon as men leave the atmosphere they are exposed to this radiation and their spacesuits or the walls of their spacecraft, if they are inside, do prevent a lot of radiation damage.
Radiation is the greatest known danger to explorers 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 rein without being damaged; the figure of 60 rems has been agreed on. The trouble is that it is extremely difficult to be sure about radiation damage—a person may feel perfectly well, but the cells of his or her sex organs may be damaged, 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 reins. So far, no dangerous amounts of radiation have been reported, but the Apollo missions have been quite short , 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, but no really effective ones have been found so far
选项
答案
explorers
解析
转载请注明原文地址:https://kaotiyun.com/show/Ffo7777K
0
大学英语六级
相关试题推荐
Peoplebornintheautumnlivelongerthanthoseborninthespring.Andtheyarelesslikelytofall【B1】______illwhentheyar
A、Itmaycauseunintendedbadresultstohumanbeings.B、Itisdevelopedwellenoughtoclonehumanbeings.C、Itwillbringmore
A、Shewonthefirstplace.B、Shewonthesecondplace.C、Shewonthethirdplace.D、Shewonnomedalsatall.C问题问的是WilmaRudolp
A、Hedoesn’tlikemessypeople.B、Hedoesn’tknowwheretheirhouseis.C、Heseesnoneedtocleanthehouse.D、Hecanthinkof
Wildducksandothermigratory(迁移的)birdscouldbeimportantcarriersofdeadlybirdflu,researcherssay.Evenso,theinfecti
A、Businesssuccesstakesahighlevelofactivity.B、Topmanagersaregenerallygiftedatjudgingpeople.C、Businesssuccesstak
A、Jogging.B、Tennis.C、Cycling.D、Swimming.B综合推断题。男士指出,在体育运动上表现最为活跃的两组人最喜欢的休闲运动是慢跑,接下来是滑雪、打网球、游泳和骑自行车,分析可知排在第三位的是打网球,故选B。
Directions:Forthispart,youareallowed30minutestowritearesume.Youshouldwriteatleast150wordsfollowingtheoutli
A、Takethemedicineasshewasdirectedtodo.B、Scheduleanotherappointmentwithherdoctor.C、Stoptakingthemedicine.D、Res
A、Georgehimself.B、George’swife.C、George’sfather.D、George’sfather-in-law.D对话中男士:说原本希望今天会遇到George。女士说George原本打算来(Georgewa
随机试题
创造“人本主义”治疗的学者是
按“五轮学说”上下眼睑所属脏腑是()
痄腮的病因是感受
盐酸地尔硫革符合下列哪些性质
会计从业资格证书是具备会计从业资格的证明文件,该证书在()范围内有效。
我国已形成了具有中国特色的地方政府债券市场,即以企业债券形式发行地方政府债券。()
某公司是一家由事业单位转而成的股份制企业。在转制之前,员工的薪酬基本上是按照职务、技术职称和工龄等来确定的,员工的工资差别不大,所以干多和干少一个样,尽管单位的效率不高,但大家觉得挺满足。但改制以后,由于企业要直接面对激烈的市场竞争,所以公司的领导层决定打
前进:倒退()
中华传统美德的根本要求是()
冯.诺依曼型体系结构的计算机硬件系统的5大部件是
最新回复
(
0
)