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
19
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
Plagiarism(抄袭)WhenIwasyoung,plagiarismwas
Nextfall,whenyouseegeeseheadingsouthforthewinter,flyingalongin
在地基或基土上浇筑混凝土时.应清除淤泥和杂物,并应有排水和防水措施。
共用题干 NarrowEscapeWehadleftthehutt
关于双胎妊娠的临床表现,正确的是()。A.子宫大小与妊娠月份相符合 B.腹部
有意想象是指事先有预定目的的想象,可分为再造想象和创造想象。前者指根据别人的描述
下列各种无机凝材料中,属于水硬性胶凝材料的是()。A:石灰B:石膏C:水泥
基金投资收益在扣除由基金承担的费用后的盈余全部归基金投资者所有,并依据各个投资者
A公司计划投资一项新项目,项目一次性总投资1000万元,建设期为2年,经营期为1
A.避免输注含IgA的血制品 B.应用胸腺素 C.骨髓移植 D.丙种球蛋白
最新回复
(
0
)