首页
登录
职称英语
[originaltext] Science fiction writers have often imagined human beings going
[originaltext] Science fiction writers have often imagined human beings going
游客
2024-06-12
12
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
Why are scientists interested in Mars?
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:https://tihaiku.com/zcyy/3630931.html
相关试题推荐
[originaltext]Yogabecomesverypopularnowadays,butitisimportantthat
[originaltext]I’mhavingproblemslivingwithColin.We’vebarelyspokento
[originaltext]M:Whatdidyoudolastnight?W:IwatchedTV.Therewasareall
[originaltext]M:Whatdidyoudolastnight?W:IwatchedTV.Therewasareall
[originaltext]Inpublicspeaking,thewatchwordispreparation.Mostofus
[originaltext]Inpublicspeaking,thewatchwordispreparation.Mostofus
[originaltext]Inpublicspeaking,thewatchwordispreparation.Mostofus
[originaltext]Ifyoufeeltiredallthetime,youdon’tnecessarilyneedto
[originaltext]Ifyoufeeltiredallthetime,youdon’tnecessarilyneedto
[originaltext]Ifyouareinyourtwenties,youownyourfirstcar,yourcar
随机试题
Ourbodiesexperienceanebbandflowofenergythroughouttheday.Thisis
Thestudentsoftenhave(heat)______discussionintheclass.heatedhaveaheated
[originaltext]M:Icouldn’tputupwithmywifeanylonger.Idon’tknowwhysh
Housingofficialssaythatlatelytheyarenoticingsomethingdifferent:
胸部增强CT不用于以下病变的诊断A.肺内结节性病变的区别 B.肺血管性病变
畸形中央尖的临床表现不包括A.位于前磨牙舌尖三角嵴上 B.尖呈圆锥形或钝圆形突
万老师对工作认真负责,是学校有名的严厉教师。一天,由于小夏上课捣乱,而且拒绝认错
关于法律部门与法律体系,下列哪一说法是错误的?()A.一国的法律体系包含已被废
单位、个人和银行办理支付结算,必须使用中国人民银行统一印制的票据凭证和结算凭证。
其接地网的最大接触电位差不应超过()。A.145V;B.248V;
最新回复
(
0
)