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
36
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/3618203.html
相关试题推荐
[originaltext]Agoodmarriagemeansgrowingasacouplebutalsogrowingas
[originaltext]Agoodmarriagemeansgrowingasacouplebutalsogrowingas
[originaltext]Agoodmarriagemeansgrowingasacouplebutalsogrowingas
[originaltext]M:Dr.Thomas?ThisisKeetBradleyfromtheDailyNews.I’dlike
[originaltext]M:Dr.Thomas?ThisisKeetBradleyfromtheDailyNews.I’dlike
[originaltext]M:Dr.Thomas?ThisisKeetBradleyfromtheDailyNews.I’dlike
[originaltext]M:Dr.Thomas?ThisisKeetBradleyfromtheDailyNews.I’dlike
[originaltext]M:Goodmorning.I’dliketospeaktoMr.Picasso,please.W:Mr.
[originaltext]M:Goodmorning.I’dliketospeaktoMr.Picasso,please.W:Mr.
[originaltext]TheChinesepeople,Ifoundout,holdontomanytraditionstha
随机试题
It’sgettingdark;we’dbettermakehome.A、outB、upC、forD、ofCmakefor为
[originaltext]W:Hi,Tim.Areyoudoingsomelast-minuteshoppingbeforethewe
Inthepopularmind,theInternetistherealizationoftheglobalvillage,
对综合重合闸的描述,叙述正确的是()A.单相接地短路时跳开单相,然后进行单
关于项目的可行性研究,以下论述中不正确的是()。A.项目的初步可行性研究
根据费雪方程式,假定名义利率为4.5%,预期通货膨胀率为4%,则实际利率为()。
资本原始积累过程的基础是 A.用暴力剥夺广大工人 B.用暴力剥夺广大农民的土
转移系统风险的方法主要有:建立多样化的投资组合和将风险资产进行对冲。()
下列关于资本结构影响因素的说法中,不正确的是( )。A.盈利能力强的企业要比盈利
患者,男,34岁。近1个月来多次因阵发性恐惧、胸闷、濒死感在医院急诊科就诊,症状
最新回复
(
0
)