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
38
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
Passage1[br][originaltext]Oneofthechallengestowhichgovernmentstoda
IrelandiscalledtheEmeraldIsleforitsrichgreencountryside,butpolitical
在我国,商标专用权保护的对象是()。A.商标 B.商品 C.已使用商标
在PPP链路建立以后,接着要进行认证过程。首先由认证服务器发送一个质询报文,终端
目前我国饮用水的标准规定1ml水中细菌总数不超过A.1 B.10 C.100
王先生,男,63岁,A型血,考古学者,每天吸烟10支以上,经常吃腌制饮食,每天蔬
既能清虚热又能截疟的药物是A.白薇B.青蒿C.地骨皮D.生地E.紫草
A.硫黄B.硼砂C.蟾酥D.常山E.明矾有涌吐痰涎、截疟功效的是
度量单位时间内某商业银行接待客户的数量,常用()度量概率分布。A.泊松分布
银行业金融机构应重点关注其客户及其重要关联方在()活动中可能给环境和社会带
最新回复
(
0
)