首页
登录
职称英语
Scientists are interested in Mars because ______. [br] [originaltext] Scie
Scientists are interested in Mars because ______. [br] [originaltext] Scie
游客
2023-11-21
101
管理
问题
Scientists are interested in Mars because ______. [br]
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、Its surface must be studied.
B、Its temperature must be raised.
C、Big spaceships must be built.
D、Its air must be purified.
答案
B
解析
转载请注明原文地址:https://www.tihaiku.com/zcyy/3205937.html
相关试题推荐
WhatisinthemindoftheTaliban?[originaltext]AtKandaharAirport,parame
WhatisTelstarXmadeof?[br][originaltext]Governmentofficialshaveex
WhatisTelstarXmadeof?[br][originaltext]Governmentofficialshaveex
WhatisTelstarXmadeof?[br][originaltext]Governmentofficialshaveex
Whatisthegeneraltopicofthelecture?[br][originaltext]Itmaybetru
Whatisthegeneraltopicofthelecture?[originaltext]Itmaybetrue,and
HowisJackyrecently?[br][originaltext]F:Hey,jack!Howareyouthesedays?
HowisJackyrecently?[br][originaltext]F:Hey,jack!Howareyouthesedays?
HowisJackyrecently?[originaltext]F:Hey,jack!Howareyouthesedays?M:No
SecretaryofStateColinPowellsaid______.[br][originaltext]Secretar
随机试题
Duringthenineteenthcentury,whenlittlewasknownaboutenvironmental-ism
Ioncefoundoutthatdoingafavorforsomeonecouldgetyouintotrouble.
WhatwasFofanachargedwith?[originaltext]Anaccusedgangleaderchargedw
Thehistoryofmodernwaterpollutiongoes【C1】______toFebruary20,1931,
Forthispart,youareallowed30minutestowritealettertoyourpenfriendi
革兰阴性细菌所致的角膜炎典型表现为A.症状严重 B.全角膜坏死穿破 C.发展
从计划的功能区分建设工程项目施工进度计划可分为()A、控制性施工进度计划 B、
(2019年真题)企业年金基金财产以投资组合为单位按照公允价值计算应当符合:投资
确诊心肌梗死的最具特异的标志物为( )。A.CK B.CK-MB C.cT
指令源分别来自于纵向和横向工作部门组织结构是( )。A.职能组织结构 B.矩
最新回复
(
0
)