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
67
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:http://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
Watchababybetweensixandninemonthsold,andyouwillobservethebasic
[img]2012q1/ct_eilm_eillist_0203_20121[/img][br][originaltext]Let’slookfirs
Designingforsustainability:whatarethechallengesbehindgreenmate
OxfordandCambridge【11】fromtherestoftheuniversitiesinGreatBritain
Steelisvaluedforitsreliability,butnotwhenitgetscold.Mostformsof
设随机变量X与Y相互独立,且EX与EY存在,记U=max{X,Y},V=min{
下列轻质隔墙工程验收项目中,不属于隐蔽验收项目的是( )。A.隔墙板甲醛释放量
据对全国规模以上文化及相关产业5.9万家企业调查,2020年上半年,上述企业实现
人们在各种认知活动中表现出来的个体差异的性格特征是()。 A.性格的态度特征
下列各项中,不属于涉税专业服务机构的是()。A.律师事务所 B.会计师事
最新回复
(
0
)