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
2017-09-04
13
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/N0iC777K
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
Everyfewweeks,outsidethemovietheatreinpracticallyanyAmericantowninthelate1910s,stoodthelife-sizedcard-boardf
Usuallythereis______trafficinthestreetsonweekdaysthanonSundays.
Atdusktheyreached______smallvillage______eastofTaiMountain.
Manypeoplecatchacoldinthespringtimeand/orfall.Itmakesuswonder...ifscientistscansendamantothemoon,whyca
Workingonanewspaperisaverybusyjob.Manynewspapers【21】eachday,andtheyhaveto【22】peoplewithallthelatestnews.The
Duringthesummersessionthesewillbearevisedscheduleofservicesfortheuniversitycommunity.Specificchangesforinterc
MostLondoncollegeshavealibrary,withafull-timeorpart-timelibrarian,whowillbeabletogivestudentsinformationont
NativeAmericansfromthesoutheasternpartofwhatisnowtheUnitedStatesbelievedthattheuniverseinwhichtheylivedwas
Thefirsttruepieceofsportsequipmentthatmaninventedwastheball.InancientEgypt,aseverywhere,pitchingstoneswa
Humanneedsseemendless.Theymightberegardedasmakingupseverallevels.Whenthereisenoughmoneytosatisfyonelevelof
随机试题
1克分子琥珀酸脱氢生成延胡索酸时,脱下的一对氢经过呼吸链氧化生成水,同时生成多少克分子ATP()(1993年)
目前我国水质型缺水、水污染、湖泊富营养化问题比较突出的地区是()。
从境外进入保税仓库、保税区、出口加工区的属于关税配额管理的农产品,应提交“农产品进口关税配额证”。
通过税收分配,从而实现社会总需求与总供给的平衡,并对资源配置等进行调节,这体现的是税收的()职能。
班主任在班级管理体制中的领导影响力主要表现在两个方面:一是职权影响力;二是()。
根据下表所提供的信息回答问题:农村基层组织中,个数不断增加的是()。
从全文来看,第一段中“苦涩原味”一语,强调了“这次历史变更”的完成要在文化上经历一个______的过程。作者说王国维死于“一种文化”。这“一种文化”是包含了多种意义的广义概念,对此理解不正确的是:
SallyKemmererhas,sofar,escapedNorthernCalifornia’srollingblackouts.ButupontheroofforherOaklandhome,workersa
_______rankssecondamongleadingtourismnations.
ManynewplaysarepresentedfirstonBroadway,thetheatreDistrictofNewYorkCity.Iftheyare【B1】______,theylatergo"on
最新回复
(
0
)