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
2023-09-10
13
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、Man will probably be able to live there in 200 years.
B、Scientists are rather pessimistic about it.
C、Man will probably be able to live there in 100,000 years’ time.
D、Scientists are optimistic about overcoming the difficulties soon.
答案
C
解析
本题考查人类移居火星的前景 (prospect)。根据短文末句Scientists estimate that this will take one hundred thousand years可知,人类可能100,000年之后才能移居火星,因此C为答案。
转载请注明原文地址:https://tihaiku.com/zcyy/3001727.html
相关试题推荐
[originaltext]Cultureshockcanbedescribedasthefeelingofconfusionan
[originaltext]Cultureshockcanbedescribedasthefeelingofconfusionan
[originaltext]Cultureshockcanbedescribedasthefeelingofconfusionan
[originaltext]Iamoneofthemanycitypeoplewhoarealwayssayingthatg
[originaltext]Iamoneofthemanycitypeoplewhoarealwayssayingthatg
[originaltext]Iamoneofthemanycitypeoplewhoarealwayssayingthatg
[originaltext]W:Couldyoutellmeabitaboutwhyyouwantedtobeadoctoran
[originaltext]W:HiFrank.Whatareyouupto?IsthatreallyaFrenchgrammar
[originaltext]M:Pleasetakeaseat,andwecanhavealittlerestbeforethel
[originaltext]M:Pleasetakeaseat,andwecanhavealittlerestbeforethel
随机试题
Mostofuswouldshyawayfrommakingpurchasesinaforeigncountryifwed
GeorgeDanielslivesinLondon.Heisawatchmaker.Hisworkcontinuesthe(
[originaltext]Manyareasaroundtheworldsufferfromfrequentlossofelec
某城市道路,快车道路面铺设工程量计算时,应不扣除()所示面积。A.绿化带 B
女性,24岁,2月前药物流产,见妊娠囊排出,流产后阴道持续少量流血。查体:腹软,
某旅行社在为游客安排住宿时,将合同约定的“三星级宾馆”擅自更换成五星级旅馆。旅行
A.人参皂苷RA类B.人参皂苷Rb类C.人参皂苷RE类D.人参皂苷Rf类E.人参
葡萄糖耐量试验中出现空腹血糖急剧升高,短时间内不恢复原值的常见原因是()A.极
在带电的电压互感器二次回路上工作时,以下做法正确的是()。严格防止短路或接地$;
根据《民用爆炸物品安全管理条例》,关于民用爆炸物品生产的安全管理的说法,正确的是
最新回复
(
0
)