首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
专升本
At the first sight the planet Mars does not appear very welcome to any kind of life. It has very little oxygen and water; the te
At the first sight the planet Mars does not appear very welcome to any kind of life. It has very little oxygen and water; the te
admin
2010-01-08
44
问题
At the first sight the planet Mars does not appear very welcome to any kind of life. It has very little oxygen and water; the temperature at night is below -50℃ and winds of 100 miles per hour cause severe dust storms. However, the surface of the planet seems to show that water flowed across it some time in the past, and it is believed that there is enough ice at the poles to cover the planet with water if it melts. Although there is no life on the Mars now, some scientists think that there may have been some form of life long time ago. At that time, the planet had active volcanoes; the atmosphere was thicker and warmer; and there was water. In fact, in some ways the Mars may have been similar to the Earth, where life exists.
Some people believe that the Mars could support life in the future if the right conditions were produced. The first step would be to warm the planet using certain gases which trap the Sun’s heat in the planet’s atmosphere. With warmth, water and carbon dioxide (二氧化碳), simple plants could begin to grow, These plants could slowly make the Mars more suitable for living. It is estimated that the whole process might take between 100,000 and 200,000 years. In the meantime, people could begin to live on the planet in special closed environments. They would provide a lot of useful information about conditions on the Mars and the problems connected with living there.
There could be life on the Mars in the future if ______.
选项
A、it supported life in the past
B、certain gases are used to cool the planet
C、the atmosphere can be heated enough to grow simple plants
D、the planet’s volcanoes become as active as they were in the past
答案
C
解析
转载请注明原文地址:https://kaotiyun.com/show/RXvC777K
本试题收录于:
英语题库成考专升本分类
0
英语
成考专升本
相关试题推荐
Mrs.Smithtreatedherlittledogquite______.Attheendofthestory,you’llfindthat______.
Johnpromisedtokeephismother______ofhowthingsweregoingonwhenhestudiedinEngland.
HolidaycelebrationsintheUnitedStatesoften______.Thejudge______.
WhydidKathyAllenneedtofindherbirthmother?Howisfindingabirthmotherlikegettingakeytoadiary?
It’sabouttimeyou______alittlelessmoney.
(LittledidIexpectthatUncleSamwoulddiesosoon).IfoundhimingoodhealthwhenIcalledonhimonlyacoupleofweeksa
Youarewelcometostaywithus______yousharetherent.
However,(theChinesehadlittleornocontactwithEuropeatthattime),soitisnotclearwhetherornottheEuropeanslearne
Tocultivatetheabilitytouseourhands,mother______thatwedidourshareinkeepingthehouse.
随机试题
背景某办公大楼工程,地下为3层,地上20层。裙房4层,檐高27m,报告厅混凝土结构局部层高8m,演艺厅钢结构层高8m。框架一剪力墙结构,基础埋深12m。某施工总承包单位中标后成立了项目部组织施工。施工过程中发生了如下事件:事件一:项目部编制了《安全生产
律师有哪些情形,司法行政机关可以吊销其律师执业证书
简述加里培林的智力技能的阶段。
右冠状动脉
某工程在9月10日发生了地震灾害迫使承包人停止施工。9月15日发包人与承包人共同检查工程的损害程度,并一致认为损害程度严重,需要拆除重建。9月17日发包人将依法单方解除合同的通知送达承包人,9月18日发包人接到承包人同意解除合同的回复。依据我国《合同法》的
会计基础工作规范规定,除出纳人员不得兼任稽核、会计档案和收入、费用、债权债务的记账工作外,会计工作岗位设置可以()。
出口监管仓库可以下设分库。
对于投资企业而言,实际收到的股票股利不作账务处理,但应在备查簿中登记。()
办公室的明度指标应能给人以()。
甲型H1N1流感是由变异后的新型H1N1流感病毒所引起的急性呼吸道传染病。以下对甲型H1N1流感的认识错误的是()。
最新回复
(
0
)