首页
登录
职称英语
Scientists are interested in Mars because ______. [originaltext] Science-fi
Scientists are interested in Mars because ______. [originaltext] Science-fi
游客
2024-10-28
25
管理
问题
Scientists are interested in Mars because ______.
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’s mostly carbon dioxide. Apart from that, there are other problems to be overcome. For example, the temperature would have to be raised from 60 below zero to 15 above it. Scientists who study Mars have let out the programme that they can follow. To begin with, they will have to find out whether life has ever existed on the 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 are 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 100,000 years.
选项
A、people might have to migrate there someday
B、people could live there naturally
C、life has ever existed there
D、its atmosphere is quite different
答案
A
解析
转载请注明原文地址:http://tihaiku.com/zcyy/3820504.html
相关试题推荐
WhyhasthereturnofDiscoverybeendelayedfor24hours?[originaltext]Th
WhodidPresidentBushmeetwith?[originaltext]AftermeetingwithDefenseSe
Whatisthetalkmainlyabout?[br][originaltext]I’mgoingtointroduce
Whatisthetalk’mainlyabout?[br][originaltext]Areelectriccarsthew
Whatisthetalk’mainlyabout?[br][originaltext]Areelectriccarsthew
Whatisthetalk’mainlyabout?[originaltext]Areelectriccarsthewayof
Whatistherelationshipbetweenthespeakers?[br][originaltext]M:Hi,Sue.
Whatistherelationshipbetweenthespeakers?[br][originaltext]M:Hi,Sue.
WhatplaguearesomeAfricancountriesfacing?[br][originaltext]AUnited
WhatcanbeinferredaboutthedeathofthePalestinianteenager?[originaltext]
随机试题
Thevegetativeformsofmostbacteriaaxekilledbydryinginair,althought
Fearingthattheywilllosetheirbest,anumberofcitiesaroundChina,second-
Noonecandenythatpesticidehaveimprovedtheabilityoffarmerstobrin
Thedirectorrequiredthateverymemberinhisdepartment(refer)______tothis
[originaltext]Exportersaregoingtohavetochangeiftheyhopetopenetr
______(最使人好奇的是),themanagerdidn’tknowhowmanyworkerstherewereinhiscomp
属于乙类传染病的是()。A.鼠疫 B.霍乱 C.麻风病 D.猩红热
简述艾里克森人格发展理论。
杜威强调教师在教育中的中心地位,所以他的教育理论也被称为教师中心理论。()
在运输企业组织客车运行时,大循环运行方式是将客车安排在企业运营区域内()上顺序轮
最新回复
(
0
)