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
19
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
G由randomizedcontrolledtrial和behavior-modificationtools定位到G段。第1句说要使用尽可能多的行为修正工
Youshouldhaveputthemilkintotherefrigerator,Iexpectit______badbyno
证券公司集合计划销售结算资金是指()。 Ⅰ.由证券公司及其推广机构归集 Ⅱ.
柴胡证往来寒热,休作有时的产生机制主要是A.血弱气弱,腠理开 B.藏府相连,邪
下列各项中,不符合内部牵制的要求的是()。A、出纳人员管票据 B、出纳人员
中央经济工作会议提出的2009年经济工作的首要任务是保持经济平衡较快发展,要着力
某照相机厂开发了一款新型照相机,厂方经过市场调查和论证,决定投入生产,并明确就
某均质黏性土边坡,以下哪个选项情况下边坡的稳定系数最大?( )A.有顺坡渗流的
根据数据的来源不同,风险管理信息系统的风险数据可以分为()。A.内部数据
赵某因绑架罪被甲省A市中级法院判处死刑缓期两年执行,后交付甲省B市监狱执行。死刑
最新回复
(
0
)