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
75
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
but no really effective ones have been found so far
解析
转载请注明原文地址:https://kaotiyun.com/show/hfo7777K
0
大学英语六级
相关试题推荐
A、Thegraduatestudentscouldunderstandthelecture.B、Theundergraduatestudentscouldunderstandthelecture.C、Boththeunde
A、Becausethey’requiteimpressivewithastrongeffect.B、Becausetheyarenotsofrustratingasotherexpressions.C、Becauset
A、Becauseshehadtoomanythingswithher.B、Becauseshewassick.C、Becauseshewasquitelazy.D、Becauseshedidn’twanttog
A、Hewantstoliveoffcampus.B、Thereareadvantagesanddisadvantagestolivingoffcampus.C、Livingspaceinthedormiscrow
AprilFools’Special:History’sHoaxesHappyAprilFools’Day.Tomarktheoccasion,NationalGeographicNewshascompiled
RisingbrightandearlyonaSaturdayusedtobeamatterofsurvivalinGermany.【C1】______the1990smostshopsclosedforthe
A、Leisuresportingactivities.B、Averageageofathletes.C、Durabilityofsportingequipment.D、People’spreferenceforsporting
"Wethoughttherewasafutureinnuclearpowerwhennooneelsebelievedinit,"saysAnneLauvergeon,chiefexecutiveofAreva
For$150,onecanbetreatedtothe______dinner,andovernightaccommodationsinthishotel.
Usingextremelydifferentdecoratingschemesinadjoiningroomsmayresultin______andlackofunityinstyle.
随机试题
丈量油管时尺的一端与油管接箍对齐,另一端与油管外螺纹()对齐。
混凝土坝的纵缝的形式不包括()。
某公司拟实施某项技术改造项目,预计需要新投资6000万元,拆除旧厂房设备将损失900万元,若这些厂房设备的残值为50万元,则该项目的总投资为()万元。
下列各项中,更适合于企业采用集权型财务管理体制的情形有()。
在管理的各项制度中,最具有规范性和技术性的职能是()。
试述自然人民事行为能力及其种类。[浙江财大2016年研]
作为社会公共生活中应当遵守的行为准则,构成整个社会道德体系的基础层次的是()
A、62B、65C、67D、76C
AccordingtoUNICEF,around564millionIndians,nearlyhalfthepopulation,stilldefecateintheopen—infields,forests,ne
()守门员()中线()右翼()巡边员
最新回复
(
0
)