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
财经
If the population of the earth goes on increasing at its present rate, there will eventually not be enough resources left to sus
If the population of the earth goes on increasing at its present rate, there will eventually not be enough resources left to sus
admin
2015-01-08
19
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. But none of the other planets in our solar system are capable of supporting life at present. One possible solution to the problem, however, has recently been suggested by an American scientist, Professor Carl Sagan.
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 organisms, which 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 then 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.
On Venus there is a lot of______.
选项
A、water
B、carbon dioxide
C、carbon monoxide
D、oxygen
答案
B
解析
由第二段的最后一句话中的“there is only a tiny amount of water there(Venus)”得知。A选项错误。第三段结尾说明,藻类通过火箭运往金星,然后“In a fairly short time,the algae will break down thecarbon dioxide into oxygen and carbon”,说明金星上有大量的二氧化碳。C和D选项错误。故选B。
转载请注明原文地址:https://kaotiyun.com/show/FDgc777K
本试题收录于:
英语题库银行系统招聘考试分类
0
英语
银行系统招聘考试
相关试题推荐
有三箱苹果分别标记为A、B、C,若要平均分给3个人,则需从A中取出其中的放到B中,然后从B中取出其中的放到c中,此时A、B、C个数相同均为20,则三箱苹果原来的个数比()。
It’8bad__________foramantosmokeinthepublicplaceswheresmokingisnotallowed.
Couldthebadolddaysofeconomicdeclinebeabouttoreturn?SinceOPECagreedtosupply—cutsinMarch,thepriceofcrudeoilh
Shewashardworkingandcompetent;________,shehadnotroublebeingrecommended.
refertothefollowingbulletin.RESERVATIONS:Reservationsarerequiredforallclub,custom—class,andsleeping—caraccommodatio
DianaJacobsthoughtherfamilyhadaworkableplantopayforcollegeforher21-year-oldtwinsons:acombinationofsavings,
Buildingahousecostsquitealotofmoney.Supposeyouplantobuildahouse.Yourfirststepwillbetofindarightpieceof
Itisimperativethatstudents______theirtermpapersontime.
ArthurMiller(1915-2005)isuniversallyrecognizedasoneofthegreatestdramatistsofthe20thcentury.Miller’sfatherhadmov
You’rebusyfillingouttheapplicationformforapositionyoureallyneed;let’sassumeyouonceactuallycompletedacoupleo
随机试题
在网络图中,工作代号的标写应遵循的原则是()
化脓性感染形成脓肿后,外科治疗的基本原则是()
下列实验室检查结果中,支持再生障碍性贫血的是
紫花毛地黄中的成分具有大黄中的成分具有
下列情形国家不给予国家赔偿的有哪些?
[资料三]方先生为某公司雇员,每月工资3000元。2011年该公司开始实施雇员持股激励,实行股票期权计划。2011年6月28日,该公司授予方先生股票期权5万股,授予价2.5元/股;该期权无公开市场价格,并约定2011年12月28日起方先生可以行权
下列词语没有错别字的一项是()
许可这种权力,公安机关通常是通过()。
C++语言本身没有定义I/O操作,但I/O操作包含在C++实现中。C++标准库iostream提供了基本的I/O类。I/O操作分别由两个类istream和()提供。
Shesaidshewouldn’tcallusthenextday,______she?
最新回复
(
0
)