首页
登录
职称英语
For most of the 20th century, there has been life on Mars, or, at least in the m
For most of the 20th century, there has been life on Mars, or, at least in the m
游客
2023-08-01
75
管理
问题
For most of the 20th century, there has been life on Mars, or, at least in the minds of the Earthlings, who live on its closest planetary neighbor. But could life exist on Mars, given that it is a very【S1】world from what it was 3.8 billion years ago? It has【S2】no atmosphere. It has a barren surface, which is bathed in ultraviolet【S3】from the sun, and there is no liquid water on the surface of the planet(although there are ice caps at its poles). Mars had moved from a warm, wet place -- a likely home for life -- to a dead world of dust storms,【S4】and vast canyons. It happened because its carbon dioxide atmosphere could not remain【S5】in a wet environment. Carbon dioxide reacted with rocks, and it was rapidly absorbed by water, where it became solid carbonates(碳酸盐)and【S6】to the bottom of seas. It is a greenhouse gas, which【S7】heat from the sun. As it disappeared from the Martian atmosphere, the planet began to cool. Its atmosphere grew thinner and all the water on the surface【S8】This is a fate that the Earth escaped because of water vapor and other greenhouse gases, which are【S9】present in its atmosphere.
And this is not necessarily the end of the story. Mars could one day be a warm, wet world again, if sufficient greenhouse gases were【S10】into the atmosphere -- a task our descendents may one day set themselves when they begin to colonize the solar system.
A)froze I)radiation
B)different J)distinguished
C)steady K)virtually
D)traps L)earthquakes
E)volcanoes M)sank
F)adequate N)constantly
G)stable O)confines
H)released
选项
答案
B
解析
转载请注明原文地址:https://tihaiku.com/zcyy/2888006.html
相关试题推荐
[originaltext]Theeconomicdepressioninthelate-nineteenth-centuryUnited
[originaltext]Theeconomicdepressioninthelate-nineteenth-centuryUnited
[originaltext]Theeconomicdepressioninthelate-nineteenth-centuryUnited
Whatdoestheauthormeanbysaying"the21stcenturyequivalentofbeingcaught
[originaltext]AssettlersmovedtoCaliforniainthemid-nineteenthcentury
[originaltext]AssettlersmovedtoCaliforniainthemid-nineteenthcentury
[originaltext]Theagriculturalrevolutioninthe19thcenturyinvolvedtwo
【S1】[br]【S10】Caroundtheendofourcentury,意为在我们这个世纪结束后,表示时间的紧迫,故选C。
[originaltext]ItwasinthesixteenthcenturythatGeronimoCardano,aphys
[originaltext]ItwasinthesixteenthcenturythatGeronimoCardano,aphys
随机试题
Electroniccomputers,whichhavemanyadvantages,cannotcarryoutcreativeworka
ThePresidentmadehislastpublic______beforehistermofofficeended.A、appe
电阻式(电阻抗法)血液分析仪的发明者是A.Moldavan B.Poole
从()来看,传统的计划演出体制正在向市场演出体制转变。A.市场主体 B.演出体
水轮机型号表示方法中,可逆式水轮机在型号后加()。A.S B.L C.
(2012年、2014年)下列可享受优惠政策的项目中,不通过企业所得税纳税申报表
施工人员对涉及()的试块、试件以及有关材料,应当在建设单位或者工程监理单位
根据资产的定义,下列各项中不属于资产特征的是( )。A.资产是企业拥有或者控制
监理单位在工程勘察阶段提供相关服务时,向建设单位提交的工程勘察成果评估报告中应包
自动喷水灭火系统安装要求包括()。A.自动喷水灭火系统的管道横向安装宜设2‰~
最新回复
(
0
)