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
99
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.
In the long run, the most difficult problem caused by population growth on earth will probably be the lack of______.
选项
A、food
B、oil
C、space
D、resources
答案
C
解析
由第一段可知,如果人口按照目前速度持续膨胀的话,地球上最终会缺乏资源来维持这么多的生命。即使科学家发明出替代资源,拥挤的人口也使我们不得不到其他星球寻找生存空间。但是目前太阳系还没有发现能维持生命的行星。因此和缺乏资源相比,缺乏生存空间才是最令人担忧、最难解决的问题。所以正确答案为C。
转载请注明原文地址:https://kaotiyun.com/show/TDgc777K
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
Racket,dinclamor,noise.Whateveryouwanttocallit,unwantedsoundisAmerica,smostwidespreadnuisance.Butnoiseismoreth
PassageoneManyobjectsindailyusehaveclearlybeeninfluencedbyscience,buttheirformandfunctlon’theirdlmensionsand
January15EstherChen555QueensRoadLeeds,EnglandDearDr.ChenThankyouforyourletter.Weunderstandthatyouhav
DowntownArtisan’ClubArtExhibitPleasemarkSaturday,October21,onyourcalendarssothatyoucanattendtheinaugural
From:MitchellGlassTo:LoisWest
Subject:ManythanksDearMs.West,Iwouldliketothankyoufo
ATTENTION!PARKVISITORSAsofJune1st,2006,theTrentonCountyDepartmentofParkServicesisinstitutingthefollowing
Thiscourseis______mustforstudentswhowanttoworkinthefilmindustryas______editor.
Modernscientistsdividetheprocessofdyingintotwostages—clinicalortemporarydeathandbiologicaldeath.Clinicaldeatho
ArthurMiller(1915-2005)isuniversallyrecognizedasoneofthegreatestdramatistsofthe20thcentury.Miller’sfatherhadmov
Thehumannoseisanunderratedtool.Humansareoftenthoughttobeinsensitivesmellerscomparedwithanimals,【C11】______this
随机试题
用事件A、B、C表示下列各事件:三个都出现;
下列各项中,对气机升降运动起枢纽作用的是
A、手镯、足镯B、方颅C、颅骨软化D、鸡胸、漏斗胸E、“X”、“O”型腿3个月~6个月佝偻病患儿可见()
中等强度运动量的心率简单算法是
脑组织在正常情况下主要利用葡萄糖供能,只有在下述哪种情况下,脑组织主要利用酮体
环境影响评价按照环境要素可以划分为()。
作为矿山开采系统的重要组成部分,()是保障矿井建设和矿山开采安全的主要设施。
2015年11月,某企业在税务稽查过程中,被税务机关发现当年6月应纳的税款,由于核算错误,一直没有缴纳。同时发现有以下事项,该项税款可优先于()事项中的债权、罚款执行。
以下适于需求价格弹性大小与销售收入的论述中,正确的是()。
A、Theimprovementofagriculturalinfrastructure.B、Theexpansionoffarmlandindevelopingcountries.C、Thecooperationofthe
最新回复
(
0
)