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
57
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
Largesumsofmoney______eachyearinpaintingthesteelworkofbridges,ships,
ImprovingYourMotivationforLearningEnglishI.Theimportance
[originaltext]TheUKgovernmentisproposingagraduatetaxforstudentsin
We【C1】______upacamerafortheveryfirsttime.Wesnapsomepictures.【C2
根据下面资料,回答 "Hithere.How′sitgoing?"
资本市场的投资性开放包括()。 Ⅰ.融资的开放 Ⅱ.投资的开放 Ⅲ.商品的
在法律的概念中,严格意义上的法律专指国家立法机关制定的( )。A.规范性文件
开展工程项目安全预评价工作,应在项目()进行。A.可行性研究阶段 B.设
(2020年真题)下列工程量中,监理人应予计量的有( )。A.由于工程量清单缺项
双代号网络计划中的关键线路是指()。A.总时差为零的线路 B.总的工作持续时
最新回复
(
0
)