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
33
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
某公司销售数据库的商品、仓库关系模式及函数依赖集F1、F2如下:商品(商品号,
(2015年真题)关于基金业绩评价,以下表述正确的是()。A.基金业绩评价
为保障铁剂治疗效果,应提醒患儿不要在用药同时食用A.肝 B.大米 C.白面
病人正虚表气不固,外受风邪,汗出恶风,身重,小便不利,舌淡苔白,脉浮,治宜选用A
(2016年真题)根据法律规定,下列哪一种社会关系应由民法调整?A.甲请求税务机
赵向杨借款1万元,约定1年后还清。但2年过去,赵仍未还款,杨多次索要未果,向某县
可用于治疗心房颤动的药物有()A.华法林 B.阿司匹林 C.达比加群酯 D
变配电所综合自动化软件系统设计应遵循如下原则中的()。A、当设有后置机时
关于耐火电缆要求的说法,正确的有( )。A.A级的耐火焰温度950~1000℃
患者APTT延长,提示下列哪一组凝血因子缺乏A:FⅧ、FⅨ、FⅪ B:FⅧ、F
最新回复
(
0
)