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
外语
A、The way to ensure the survival of the human race on Venus. B、The way to breed organisms on Venus. C、The way to reduce the popu
A、The way to ensure the survival of the human race on Venus. B、The way to breed organisms on Venus. C、The way to reduce the popu
admin
2010-08-21
45
问题
If the population of the Earth goes on increasing at its present rate, there will eventually not be enough resources left to sustain life on the planet. By the middle of the 21st century, if present trends continue, we will have used up all the oil that drives our cars, for example. Even if scientists develop new ways of feeding the human race, the crowded conditions on Earth will make it necessary for us to look for open space somewhere else.
An American scientist, Professor Carl Sagan, believes that before the earth’s resources are completely exhausted, it will be possible to change the atmosphere of Venus and so create a new world almost as large as Earth itself. The difficulty is that Venus is much hotter than the Earth and there is only a tiny amount of water there.
Sagan proposes that algae, an organism that can live in extremely hot or cold atmospheres and at the same time produce oxygen, should be bred in conditions similar to those on Venus. As soon as this has been done, the algae will be placed in small rockets. Spaceships will than fly to Venus and fire the rockets into the atmosphere. In a fairly short time, the algae will break down the carbon dioxide into oxygen and carbon.
When the algae have done their work, the atmosphere will become cooler but before man can set foot on Venus, it will be necessary for the oxygen to produce rain. The surface of the planet will still be too hot for men to land on it but the rain will eventually fall and in a few years something like Earth will be reproduced on Venus.
选项
A、The way to ensure the survival of the human race on Venus.
B、The way to breed organisms on Venus.
C、The way to reduce the population of the Earth.
D、The way to conquer the universe.
答案
A
解析
该题问“文章谈论的主要话题是什么?”文章开头就提及“Even if scientists develop new ways of feeding the human race, the crowded conditions on Earth will make it necessary for us to look for open space somewhere else.”而后谈到在金星生存的可能性。因此,A项“人类正金星生存的方法”是正确的。
转载请注明原文地址:https://kaotiyun.com/show/Kt7K777K
0
大学英语六级
相关试题推荐
Everyyeartelevisionstationsreceivehundredsofcomplaintsabouttheloudnessofadvertisements.However,federalrulesforbi
Itiscustomaryforadultstoforgethowbadanddullandlongschoolis.Thelearningbymemoryofallthebasicthingsonemus
Mostpeoplewhotravellongdistancescomplainofjetlag(喷气式飞行时差反应).Jetlagmakesbusinesstravelerslessproductiveandmorepr
Mostpeoplewhotravellongdistancescomplainofjetlag(喷气式飞行时差反应).Jetlagmakesbusinesstravelerslessproductiveandmorepr
A、Theygetalongsuccessfully.B、Theyareindifficulties.C、Theyaredivorced.D、Theyloveeachotherdearly.C4个选项都是关于“they”,其
Ithasbeenknownsinceancienttimesthatcertainplantsregularlyopentheirleavesindaytimeandclosethematnight.Itwas
Wearerapidlyneartheendofthiscourseinthehistoryofclassicalmusic.Wehavecoveredseveral【B1】______.inaveryshor
TheHistoryofCoca-ColaToday,thecompany’strademarkisworld-famousanditsproductsaverageastaggering400millionse
A、Tocompletehis/herpersonalinformation.B、Tomakeacoverletterwiththese.C、Toimpresstheemployers.D、Todistinguishth
Sheoftencomplainsaboutnot______(感到自己在工作上不受赏识)。
随机试题
自2012年年初以来,A公司出现不能清偿到期债务且资产不足清偿全部债务的情况。2012年12月l7日,人民法院经审查裁定受理了A公司的破产申请,并指定了管理人。在该破产案件中,存在下述情况:(1)2011年10月8日,B公司向C银行借款1000万元,期
Wits值用于分析
患者,女性,33岁,停经8个月,第一胎,阴道大量流血3小时入院。出血时不伴有腹痛及阴道流水。既往有2次人流史,药物流产1次。查体:P120次/分,BP87/56mmHg,神清,轻度贫血貌,宫高30cm,腹围95cm,胎位LSA,FHR150次/分。患者
[2010年,第86题]在电动机的继电接触控制电路中,具有短路保护、过载保护、欠压保护和行程保护,其中,需要同时接在主电路和控制电路的保护电器是()。
同时放散热、蒸汽和有害气体,或仅放散密度比空气小的有害气体的工业建筑,除设局部排风外,宜在上部区域进行自然或机械的全面排风,其排风量设计()。
呆账发生后的处理原则包括()。
下列各项说法中,正确的有()。
科学家们发现,一种曾在美洲普遍栽培的经济作物比目前的主食作物如大米和小麦,含有更高的蛋白质成分。科学家们宣称,推广这种作物,对那些人口稠密、人均卡路里和蛋白质摄入量均不足的国家是很有利的。下列哪项如果为真,最能对科学家的宣称产生质疑?
在人类历史上,原始社会的经济关系产生了原始共产主义道德,封建社会的经济关系产生了封建主义道德,资本主义社会的经济关系产生了资本主义道德,社会主义社会的经济关系产生了社会主义道德。这说明()
DictationListentothepassage.Forquestions21~25,fillintheblankswiththeexactwordsorphrasesyouhear.Therei
最新回复
(
0
)