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 atmosphe
Space is a dangerous place, not only because of meteors (流星) but also because of rays from the sun and other stars. The atmosphe
admin
2011-03-01
60
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 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 (辐射) from the sun are screened off. As soon as men leave the atmosphere they are exposed to this radiation but 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 rem 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 (畸形的) children or even grandchildren. Missions of the Apollo flights have had to cross belts of high radiation and, during the outward and return journeys, 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 space laboratory. Rugs might help to decrease the damage done by radiation, but no really effective ones have been found so far.
It can be inferred from the passage that ______.
选项
A、radiation is not a threat to well-protected space explorers
B、astronauts will have deformed children or grandchildren
C、protection from space radiation is no easy job
D、the Apollo mission was very successful
答案
C
解析
本文最后一句说明了至今还没有发现有效抵制辐射侵害的手段,说明了防御辐射作用不是件容易的事情。
转载请注明原文地址:https://kaotiyun.com/show/NAkd777K
本试题收录于:
公共英语三级笔试题库公共英语(PETS)分类
0
公共英语三级笔试
公共英语(PETS)
相关试题推荐
Ithasalwaysbeenaproblemtodecidewhether"popularmusic"ismusicwhichrepresentsthepeopleorissimplymusicthatthe
Ithasalwaysbeenaproblemtodecidewhether"popularmusic"ismusicwhichrepresentsthepeopleorissimplymusicthatthe
Ithasalwaysbeenaproblemtodecidewhether"popularmusic"ismusicwhichrepresentsthepeopleorissimplymusicthatthe
Ithasalwaysbeenaproblemtodecidewhether"popularmusic"ismusicwhichrepresentsthepeopleorissimplymusicthatthe
Whatdoesthedoctorsuggestthemanshoulddo?
SupposethatyouhavegotthenewsthattheUniversityofScienceandTechnologyofChinaisofferingascholarshipinchemist
Wheredidthewomanfindoutabouttheuniversitystation?
AspeciallabattheUniversityofChicagoisbusyonly【C1】______.Itisadream【C2】______whereresearchersareatwork【C3】___
Thelongyearsoffoodshortageinthiscountryhassuddenlygivenwaytoapparentabundance.Storesandshopsarechokedwithf
Thelongyearsoffoodshortageinthis’countryhavesuddenlygivenwaytoanapparentabundance.Storesandshopsarechokedw
随机试题
凝胶调剖剂的成胶时间是以()出现拐点所经历的时间。
甲公司2014年12月31日的资产负债表如下:公司2014年的销售收入为100000元,销售净利润为10000元,净利润的50%分配给投资人。公司的资产除固定资产以外都随销售量的增加而增加;负债及所有者权益中,只有应付费用和应付账款随销售量同比变化
关于仲裁调解,下列哪些表述是正确的?(2010年试卷三第8l题)
由于微观粒子的碰撞、转动和振动等热运动而引起能量从高温部分传向低温部分的现象被称为()
目前我国的利率政策是()
基金份额持有人是()。Ⅰ.基金的出资人Ⅱ.基金资产的所有者Ⅲ.基金投资回报的受益人Ⅳ.基金的管理者
开办银团贷款业务的银行应当定期向当地银行业协会报送银团贷款有关信息,具体包括()。
“飞流直下三千尺,疑是银河落九天”是唐代诗人李白描写()的诗句。
简述想象的含义及其功能。
DemonstratorsrallyatLosAngelesCityHallduringthefirstWomen’sMarch,heldonJan.21,2017,onedayafterPresidentTrum
最新回复
(
0
)