首页
登录
职称英语
At the first sight the planet Mars(火星)does not appear very welcome to any ki
At the first sight the planet Mars(火星)does not appear very welcome to any ki
游客
2024-01-19
7
管理
问题
At the first sight the planet Mars(火星)does not appear very welcome to any kind of life. It has very little oxygen and water, the temperature at night is below -50°C 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, 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. [br] People may be able to live on the Mars______.
选项
A、within the next 200,000 years
B、only 200,000 years from now
C、only 150,000 years from now
D、as soon as the planet becomes cool enough
答案
A
解析
推理判断题。第二段中“据估计整个过程也许要用10万到20万年”。所以答案A正确。
转载请注明原文地址:https://tihaiku.com/zcyy/3374728.html
相关试题推荐
[originaltext]W:Welcometoourstudio,Mr.Johnson.Youknowthisisaprogram
[originaltext]W:Welcometoourstudio,Mr.Johnson.Youknowthisisaprogram
[originaltext]W:Welcometoourstudio,Mr.Johnson.(8)Youknowthisisapro
[originaltext]W:(12)Goodeveningandwelcometothisweek’sBusinessWorld,a
[originaltext]W:(12)Goodeveningandwelcometothisweek’sBusinessWorld,a
[originaltext]W:Welcometoourstudio,Mr.Johnson.(8)Youknowthisisaprogr
[originaltext]W:Welcometoourstudio,Mr.Johnson.(8)Youknowthisisaprogr
[originaltext]Thesecretofalongandhappymarriageappearstobenotto
[originaltext]Thesecretofalongandhappymarriageappearstobenotto
[originaltext]W:Goodevening!WelcometoourTalkShowprogram.Ourguesttoda
随机试题
Lastyear’seconomyintheUnitedStatesshouldhavewontheOscarforbest
WithourSelfHelpSystem,youcanquicklyfindanswerstocommonquestionsandr
A.间断点 B.连续而不可导的点 C.可导的点,且f′(0)=0 D.可导
下列选项中,与延髓相连的脑神经是()。A.迷走神经 B.前庭蜗神经 C.三
已知随机变量X的分布律为,k=0,1,2,…,常数C等于()。A.1 B.e
Thechangeinthatvillagewasmiraculou
人在每一瞬间,将心理活动选择了某些对象而忽略了另一些对象。这一特点指的是注意的(
β2-受体兴奋剂 A.抗炎作用B.抑制肥大细胞释放介质C.两者均有D.两者均无
根据企业所得税规定,居民企业以非货币性资产对外投资确认的非货币性资产转让所得,可
下列关于开具发票的说法,错误的有( )。A.单位和个人在未发生经营业务时,可以
最新回复
(
0
)