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
2024-06-18
2
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、Because people might have to migrate there someday.
B、Because it is very much like the earth.
C、Because it is easier to explore than other planets.
D、Because its atmosphere is different from that of the earth.
答案
A
解析
Why are scientists interested in Mars?
转载请注明原文地址:https://tihaiku.com/zcyy/3638936.html
相关试题推荐
[originaltext]M:Howdidyoulikethefireworkslastnight?W:Ireallydidn’t
[originaltext]W:Pardonme,officer!M:Yes?W:WearelookingfortheShanghai
[originaltext]W:Theshirtsellsfor3dollarseach,butit’s5ifyoubuytwo.
[originaltext]W:Theshirtsellsfor3dollarseach,butit’s5ifyoubuytwo.
[originaltext]W:Theshirtsellsfor3dollarseach,butit’s5ifyoubuytwo.
[originaltext]W:WhatcanIdoforyou?M:Yes,Iwouldlikesometicketsforn
[originaltext]W:Gotobedearlyandgetsomerest,Jack.M:ButIhavetostu
[originaltext]W:Gotobedearlyandgetsomerest,Jack.M:ButIhavetostu
[originaltext]W:Gotobedearlyandgetsomerest,Jack.M:ButIhavetostu
[originaltext]W:Gotobedearlyandgetsomerest,Jack.M:ButIhavetostu
随机试题
[originaltext]W:Hi,Dan,[23]youknowwhichlabyoumissed?Youcanhavem
—DidyoutellJuliaabouttheresult?—Oh,no,Iforgot.I______hernow.A、will
体育馆设计任务书与解答 任务书 设计题目:体育馆(南、北方地区任选)
对灯具的绝缘性能进行现场抽样检测,灯具的绝缘电阻值不应小于()M?,灯具内绝缘
某拟建工业生产项目的有关基础数据如下: 1.项目建设期2年,运营期6年。建设投
精益化管理评价中,()内容是变电运检五项管理规定的落实应用情况,包括组织
如果你的某个同事总是表现出难以接受别人批评的样子,而且他的缺点又很多,你会()
课程设计是指课程结构的编制。()
根据《建设工程工程量清单计价规范》(GB-50500-2013),若因非承包人原
(2018年真题)根据《危险化学品安全管理条例》,负有安全监管职责的部门进行安全
最新回复
(
0
)