首页
登录
职称英语
[originaltext] Science fiction writers have often imagined human beings going
[originaltext] Science fiction writers have often imagined human beings going
游客
2024-06-12
33
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、It influences the surface temperature of Mars.
B、It protects living beings from harmful rays.
C、It keeps a planet from overheating.
D、It is the main component of the air people breathe.
答案
D
解析
Why do scientists want to find out whether there is sufficient nitrogen on Mars?
文中的they(指scientists)will have to discover how much nitrogen it possesses,since nitrogen is four fifths of the air we breathe表明,科学家之所以研究火星上是否有足够的氮气是因为氮气是我们所呼吸的空气的主要成分,故D项正确。
转载请注明原文地址:https://tihaiku.com/zcyy/3630933.html
相关试题推荐
[originaltext]Todaywearegoingtotalkaboutcopyrightingworksofart.A
[originaltext]Todaywearegoingtotalkaboutcopyrightingworksofart.A
[originaltext]Todaywearegoingtotalkaboutcopyrightingworksofart.A
[originaltext]Exportersaregoingtohavetochangeiftheyhopetopenetra
[originaltext]M:Soyou’regoingtobewritingfortheschoolnewspaper?W:Yes
[originaltext]M:Mary,lastweekinourhistoryclass,ourteacheraskedusif
[originaltext]M:Mary,lastweekinourhistoryclass,ourteacheraskedusif
[originaltext]The22ndofNovember1970isadaythatthreeBritishsoldier
[originaltext]Everycountrytendstoacceptitsownwayoflifeasbeingth
[originaltext]Everycountrytendstoacceptitsownwayoflifeasbeingth
随机试题
TheCentralBankisinterestedinhowmuchmoneyisin______intheeconomy.A、cir
[originaltext]M:Hello,Jane.Whatwasthefilmlike?W:Awful.Itwasacomple
甲向乙借款而将自己的货物出质给乙,但乙将该批货物放置在露天地里风吹日晒。甲提出的
关于先天性心脏病下列哪项是错误的A.适当参加能胜任的体力劳动 B.禁止接受各种
(2017年真题)关于资产管理行业给宏观经济和金融市场体系带来的积极作用,下列说
输液生产中灌装对洁净度的要求为A:100级 B:1000级 C:10000级
新疆是我国重要的产棉区。2018年新疆棉花种植面积比上年增加411万亩,增长12
(2018年5月)劳务派遣协议使劳务派遣机构与用工单位双方建立起( )。A.形
关于焊接参数选择正确的是()。A.含合金元素较多的合金钢焊条,焊接电流大
患者,男性,61岁,2周来水肿,尿中泡沫多,尿红细胞(-),查血清白蛋白30.5
最新回复
(
0
)