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
2015-10-30
21
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°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(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
第二段第一句意为“有些人认为将来如果条件合适的话火星是能够存在生命的”。这种适当的条件就是“聚集大气层中太阳的热量”使“火星变暖”。因此确定C为正确答案。
转载请注明原文地址:https://kaotiyun.com/show/hNYC777K
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
Whenastudent,Iwasamemberofthecollegiatebasketballteam.Itwasmainlycomposedofbookishstudents.Onlyonecouldbe
FromMondayuntilFridaymostpeoplearebusy【21】,butintheeveningsandonweekendstheyarefreeandenjoythemselves.Some
FromMondayuntilFridaymostpeoplearebusy【21】,butintheeveningsandonweekendstheyarefreeandenjoythemselves.Some
Mostpeopledonotthinkoffishesandotherseaanimalsashavingvoices,andofthosewhoareawareofthefactthatmanyoft
ManypeoplebelievethatAmericanslovetheircarsalmostmorethananythingelse.Theyare【21】aboutcars.Notonlyisthecart
ManypeoplebelievethatAmericanslovetheircarsalmostmorethananythingelse.Theyare【21】aboutcars.Notonlyisthecart
OnthefourthThursdayofNovember,everyyear,AmericanscelebrateThanksgivingDay.Thedayisanationalholidaywhichisset
OnthefourthThursdayofNovember,everyyear,AmericanscelebrateThanksgivingDay.Thedayisanationalholidaywhichisset
W:Whatisyourgeneralpricerange(范围)?M:______
随机试题
气性坏疽伤口处有淡红色液体渗出并有气泡,最重要的处理措施是
小儿肾功能达成人水平的年龄为
A.内皮细胞增生B.脏层上皮细胞增生C.壁层上皮细胞增生D.成纤维细胞增生E.系膜细胞急性弥漫增生性肾小球肾炎的主要病理变化是
关于危害结果,下列哪一选项是正确的?()(2017/2/2)
城市规划管理是一项政府行政职能,它包括()。
在进行软土地基公路路堤稳定性验算和沉降计算中,下列说法中正确的是( )。
2011年6月28日8时许,上海市公安局普陀分局民警对本市桃浦镇新杨八队10号房屋进行检查时,当场从被告人张某所租借的上述房屋内查获共计3446份各类车辆通行费及加油发票,并将被告人张某抓获。经浙江省国家税务局及江苏省国家税务局鉴定,查获的3446份各类发
下列语句中有歧义的是()。
下列选项中没有语病的一项为()。
在考生文件夹下有一个数据库文件“samp3.accdb”,里面已经设计了表对象“tEmp”、查询对象“qEmp”和窗体对象“fEmp”。同时,给出窗体对象“fEmp”上两个按钮的单击事件代码,请按以下要求补充设计。(1)将窗体“fEmp”上名称为“tSS
最新回复
(
0
)