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
2024-05-06
44
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 were like that of Earth, this might be possible. But m fact, it s mostly carbon dioxide(CO2). Apart from that, there are other problems to be overcome. For example, the temperature would have to be raised from 60~C below zero to 15~C 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 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’re 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 100,000years.
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
推理判断题。本题用表示原因的连词since表明科学家研究火星上是否有足够的氮气是因为氮气占我们呼吸的空气的4/5,所以答案选D。
转载请注明原文地址:https://tihaiku.com/zcyy/3586883.html
相关试题推荐
[originaltext]Sciencefictionwritershaveoftenimaginedhumanbeingsgoin
[originaltext]Sciencefictionwritershaveoftenimaginedhumanbeingsgoin
[originaltext]Treeshaveaspectacularsurvivalrecord.Overaperiodofmo
[originaltext]Theworld’sfirstcompletelyautomaticrailwayhasbeenbuilt
[originaltext]M:Hi,Nancy.CouldIborrowsomemoneyuntilpayday?W:Uh,yeah
[originaltext]Studentswanttofindthebestwaytoputinformationintoth
[originaltext]Studentswanttofindthebestwaytoputinformationintoth
[originaltext]Studentswanttofindthebestwaytoputinformationintoth
[originaltext]PublictelevisioninAmericagrewoutofthemanylocalstat
[originaltext]PublictelevisioninAmericagrewoutofthemanylocalstat
随机试题
Aseniorofficialhadbeenstrippedofhis______andallhisprivilegesforpubli
Ifherefusesto________myplan,Icanprobablyfindsomeonemorecooperative.
[originaltext]M:Atleastitwasluckyyoufoundagaragetorepairyourcar.W
对于偏态分布资料且测量值过低才有临床意义,95%单侧正常值范围可定A.上限为P5
个人风险评价中的信用评分模型,运用先进的数据挖掘技术和统计分析方法,对消费者进行
患者女性,41岁,以月经紊乱及性欲低下就诊于妇科,激素检查发现,血浆PRL增高(
关于抗体,下列叙述正确的是A:能激活补体 B:由K细胞产生 C:免疫球蛋白都
下列哪项可用煮沸方法消毒A.心脏起搏器 B.电线 C.膀胱镜 D.玻璃器皿
区域管制区中,将( )米以下划分为若干中低空管制区。 A.4000
基坑初期排水总量的计算,应考虑的因素包括()。A.基坑初期积水量 B.可能的降
最新回复
(
0
)