首页
登录
职称英语
Scientists are interested in Mars because ______. [originaltext] Science-fi
Scientists are interested in Mars because ______. [originaltext] Science-fi
游客
2023-11-21
58
管理
问题
Scientists are interested in Mars because ______.
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、people might have to migrate there someday
B、people could live there naturally
C、life has ever existed there
D、its atmosphere is quite different
答案
A
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3205936.html
相关试题推荐
Wecaninferfromthespeakerthat[br][originaltext]Today,Iwanttotalk
WhichofthefollowingstatementsisTRUEaboutLisa?[br][originaltext]W:Now
WhichofthefollowingstatementsisTRUEaboutLisa?[br][originaltext]W:Now
WhatisthebasicpurposeofIQtests?[br][originaltext]W:Whyisitthatsom
WhatisthebasicpurposeofIQtests?[br][originaltext]W:Whyisitthatsom
WhatisthebasicpurposeofIQtests?[originaltext]W:Whyisitthatsomechil
WhatdopeoplethinkofthepresentEuropeanpoliticalleaders?[originaltext]
WhichisNOTcorrectdescriptionaboutMedullarybone?[br][originaltext]Sc
WhathasbeenhappeningtoKraft?[br][originaltext]Kraftisoneofthe
WhyisSarahworried?[originaltext]M:Hello.W:Hello,John.ThisisFlorenceR
随机试题
Drivingcars,trucksandmotorcyclesisanimportantpartofourlives.Wed
Pollutioncontrolismanagementofwastematerialsinordertominimizethe
In"Howmuchdoyouthinkheearns?"howmuchis______ofthesentence.(2009年
巴拉克-奥巴马总统上个月在对美国进步中心的一场演讲中提到,经济不公是“我们这个时代的决定性挑战”。【T1】他提出,不公平是危险的,不仅仅是因为不美观,更是
Bytheendofthisyearthefactory(produce)______20,000cellphones.willhav
简述近年来我国在加强金融基础设施建设方面取得了哪些成绩。
山楂的功效是A.消食化积,活血散瘀 B.消食化积,行气止痛 C.消食化积,行
关于制剂成品的质量检查,叙述错误的是A.咀嚼片需进行崩解时限检查 B.栓剂应进
P系列过程性能指数与C系列过程能力指数相比()。 A.C系列过程能力指数是
在9部委联合颁发的56号令中明确要求,行业标准的施工招标资格预审文件应不加修改地
最新回复
(
0
)