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
2023-08-30
57
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 were like that of Earth, this might be possible. But m fact, it s mostly carbon dioxide(CO2). Apart from that, there are other problems to be overcome. For example, the temperature would have to be raised from 60~C below zero to 15~C 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 planet 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’re surprisingly optimistic about raising the temperature on Mars and believe it could be done in 200 years. It would take a bit longer, though, to transform the atmosphere so that human beings could live there. Scientists estimate that this will take 100,000years.
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
语意理解题。解答本题的关键是overcrowding(人门过多),探索火星或许可以解决地球上人口过多的问题,即意味着或许有一天人们可以向火星移民,因此选项A正确。
转载请注明原文地址:https://tihaiku.com/zcyy/2970617.html
相关试题推荐
[originaltext](35)InaclassIteachforadults,Irecentlydidthe"unp
[originaltext](35)InaclassIteachforadults,Irecentlydidthe"unp
[originaltext](16)Atfirst,mostAmericansdidn’tthinktherewasanything
[originaltext](16)Atfirst,mostAmericansdidn’tthinktherewasanything
[originaltext]M:Hi,Lynn.Isawyouatregistrationyesterday.Isailedright
[originaltext]M:Hi,Lynn.Isawyouatregistrationyesterday.Isailedright
[originaltext]M:Hi,Lynn.Isawyouatregistrationyesterday.Isailedright
[originaltext]W:Welcometotheshow,George.M:Thankyou...it’snicetobe
[originaltext]W:Whyareyouleavingsoearly?Themoviedoesn’tstarttillsev
[originaltext]W:Whyareyouleavingsoearly?Themoviedoesn’tstarttillsev
随机试题
WhenIcametotheUnitedStates,Ididn’tspeakanyEnglish.Whenanyoneas
Forthispart,youareallowed30minutestowriteanessaycommentingonth
Iftheassetsofastockdropby$4.03billionto$74.02billion,whatwasthep
Decidewhichofthechoicesgivenbelowwouldbestcompletethepassageifi
华北地区某市一游乐园,占地面积1960余亩,是集旅游、休闲、餐饮为一体的大型体验
可反映机体近期苯接触程度的指标是A.尿酚 B.尿马尿酸 C.尿甲基马尿酸
资产评估机构的组织形式可以为()。A.个人独资企业 B.合伙企业 C.
下列关于双代号网络图的表述中,正确的有()。A.双代号网络图中,实箭线仅表
有关井筒检查孔布置说法不正确的是( )。A.专为探测溶洞或特殊施工需要时可布置
(2021年第1批真题)在电力架空线路架设中,不需装设拉线的是( )A.跨越杆
最新回复
(
0
)