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
17
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
YouTubehasbuiltaglobalreputationastheplacetogoforvideoclipsof
Whenthejobmarketworsens,manystudentsfiguretheycan’tindulge(沉溺于)in
间接销售的不足之处在于( )。A.覆盖面窄 B.影响力小 C.直观价格高
价值工程的目的是( )。A.提高产品的价值 B.对产品进行功能分析
地下或半地下丙类厂房每个防火分区的最大允许建筑面积为()mA.150 B
下述不属于抗真菌药物的是()A:灰黄霉素 B:制霉菌素 C:伊曲康唑 D:
下表为a、b两组不同土的颗粒组成成分及击实试验结果,请回答下列问题:(4)随着击
简述企业员工整体素质亚结构。
下列不属于增长能力指标的是()。A.资产增长率 B.营业收入利润率 C
(2016年真题)执业药师指导患者用药时,应首先考虑的原则是( )。A.经济
最新回复
(
0
)