首页
登录
职称英语
Scientists are interested in Mars because_______________. [originaltext] Sci
Scientists are interested in Mars because_______________. [originaltext] Sci
游客
2024-11-02
53
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/3827767.html
相关试题推荐
Allflights______becauseofthesnowstorm,wedecidedtotakethetraininstead
WhatplaguearesomeAfricancountriesfacing?[br][originaltext]AUnited
ScientistsareinterestedinMarsbecause_______________.[br][originaltext]
ScientistsareinterestedinMarsbecause_______________.[br][originaltext]
ThecauseofmostofthedivorcecasesintheU.S.is[br][originaltext]I
[originaltext]ANewNeedforTrafficLights
Wheredoesthemanwork?[br][originaltext]F:Henry,Christmasiscoming.Don’
Wheredoesthemanwork?[br][originaltext]F:Henry,Christmasiscoming.Don’
______politicianswerekilledintheterroristattack.[originaltext]Armenia
TheWHOsaysmillionsofpeopleareatrisk______.[br][originaltext]TheWo
随机试题
[originaltext]WherecanIparkmycar?(A)No,Itookthebus.(B)Parkingcosts
Virtuallyeverydayoftheyearseesanotherartbiennialopeningsomewhere
Scientistsarebuildingtheworld’sfirstthinkingrobot.It’strue.Some
[originaltext]W:Withustodayissleepscientist,DoctorIrisSaunders.M:Goo
[originaltext]M:TodaywehaveProfessorSnowinourstudio.She’sanexperton
I’veworked______fourhoursonthisarticle,I’mcompletely______.A、in:concentr
WalterIsaacson’snewbiography(传记)ofSteveJobsisaverysuccessfulbooko
根据《证券经纪人管理暂行规定》,证券经纪人不得有( )行为。 ①替客户办理账
养老保险是世界各国较普遍实行的一种社会保障制度,各国养老保险所遵循的原则大体是一
主承托区哪项是错误的A.上下颌牙槽嵴顶区 B.有疏松的黏膜下组织 C.能承受
最新回复
(
0
)