首页
登录
职称英语
[originaltext] Science fiction writers have often imagined human beings goin
[originaltext] Science fiction writers have often imagined human beings goin
游客
2024-06-03
44
管理
问题
Science fiction writers have often imagined human beings going to live on Mars. But these days, scientists are taking the idea seriously. It has a great deal to recommend it, since it might solve the problem of overcrowding on the earth. But obviously, it would not be worth making the effort unless people could live there naturally. If the atmosphere were like that of the earth, this might be possible. But in fact it is mostly carbon dioxide. Apart from that, there are other problems to be overcome. For example, the temperature Would have to be raised from 60 degrees below zero to 15 degrees above it. Scientists who study Mars have laid down the program that they can follow. To begin with, they will have to find out whether life has ever existed on the planet of Mars in the past. Secondly, they will have to make a reliable map of its surface. And finally, they will have to make a list of the gases. Above all, they will have to discover how much nitrogen it possesses, since nitrogen is four fifths of the air we breathe. They are surprisingly optimistic about raising the temperature on Mars and believe it could be done in two hundred years. It will take a bit longer, though, to transform the atmosphere so that human beings, could live there. Scientists estimate that this will take one hundred thousand years.
选项
A、Because people might have to migrate there someday.
B、Because it is very much like the earth.
C、Because it is easier to explore than other planets.
D、Because its atmosphere is different from that of the earth.
答案
A
解析
根据文中的since it might solve the problem of overcrowding on the earth可推知,科学家之所以对火星感兴趣是因为将来的某一天,人类可能不得不移居到火星上,A为答案。
转载请注明原文地址:http://tihaiku.com/zcyy/3617990.html
相关试题推荐
[originaltext]Iknewitwouldn’tbelongbeforetheydiscoveredmyescapef
[originaltext]Iknewitwouldn’tbelongbeforetheydiscoveredmyescapef
[originaltext]M:Ow!Thathurts!W:Whathappened?Didyoucutyourself’?M:Ye
[originaltext]M:Ow!Thathurts!W:Whathappened?Didyoucutyourself’?M:Ye
[originaltext]SomestudentsattheOpenUniversityleftschool20yearsago
[originaltext]Doyouhavetroublesleepingatnight?Thenmaybethisisfor
[originaltext]Doyouhavetroublesleepingatnight?Thenmaybethisisfor
[originaltext]BritishColumbiaisthethirdlargestCanadianprovince,both
[originaltext]BritishColumbiaisthethirdlargestCanadianprovince,both
[originaltext]BritishColumbiaisthethirdlargestCanadianprovince,both
随机试题
GetWhatYouPayFor?NotAlways[A]Themostexpensiveelectioncampaign
Apple’sStanceHighlightsaMoreConfrontationalTechIndustry[A]T
[originaltext]Abitofrainandwindinsummercanbenice.Butbadstorms
肾孟肾炎的易感因素有()A.尿路梗阻或畸形 B.盆腔炎症 C.机体抵抗力下降
关于桥梁墩台施工的说法,正确的是()。A:简易活动脚手架适宜于25m以下的砌石
截至2015年年末,保障基金管理规模265.17亿元,保障基金和保障基金公司累计
患者,男,70岁,喘咳日久,现气息短促,呼多吸少,喘咳剧烈时伴尿失蘩,面青肢冷,
C
下列哪一项不属于下丘脑调节肽?( )A.促甲状腺激素释放激素 B.血管升压素
中国公民在M国法院进行民事诉讼,其申请财产保全的权利受到限制,中国法院于是也对该
最新回复
(
0
)