首页
登录
职称英语
Scientists are interested in Mars because_______________. [br] [originaltext]
Scientists are interested in Mars because_______________. [br] [originaltext]
游客
2023-11-23
61
管理
问题
Scientists are interested in Mars because_______________. [br]
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、can raise the temperature of Mars
B、can protect living beings from harmful rays
C、can change the atmosphere of Mars
D、is an important part of the air people breathe
答案
D
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3213201.html
相关试题推荐
[originaltext]W:There’sbeenalotoffocusonthefundingincreasethatwasr
[originaltext]W:Oneofthoseministerswhohadtogointothechambertovote
[originaltext]W:Oneofthoseministerswhohadtogointothechambertovote
[originaltext]W:Oneofthoseministerswhohadtogointothechambertovote
[originaltext]M:Cindy,you’vebeendoingresearchondisciplinaryliteracy
[originaltext]M:Cindy,you’vebeendoingresearchondisciplinaryliteracy
[originaltext]M:Cindy,you’vebeendoingresearchondisciplinaryliteracy
[originaltext]M:Hey,Cathy,didyoureadthisarticleinamagazine?[1]I
[originaltext]M:Hey,Cathy,didyoureadthisarticleinamagazine?[1]I
[originaltext]M:Hey,Cathy,didyoureadthisarticleinamagazine?[1]I
随机试题
Lookatthestatementsbelowandatthefivecommentsbyfivetopbusinesspeopl
Thisplay,______,isverywonderful;therearemanyinterestingcharactersin
Thepolice______thelostboyintheforest.A、weresearchingB、wasfindingC、were
[originaltext]NowadaystheOlympicsareperhapsthebestknowngamesofanc
紫苏与生姜都具有的功效是A、解表,和中化湿 B、解表,理气安胎 C、解表,止
把下面的六个图形分为两类,使每一类图形都有各自的共同特征或规律,分类正确的一项是
第二次世界大战全面爆发的标志性事件是()。A.1939年9月1日德国突袭波兰
某建筑设有防火卷帘系统,检测疏散通道上设置的防火卷帘的联动控制功能,下列描述符合
(2017年真题)个人经营贷款的贷款期限在3年(含)以内的,可采用按月付息、到期
(2017年真题)工程项目施工质量保证体系的目标是( )。A.控制和保证施工产
最新回复
(
0
)