首页
财务会计
医药卫生
金融经济
考公考编
外语考试
学历提升
职称考试
建筑工程
IT考试
其他
登录
财务会计
Passage 2 If the population of the eart
Passage 2 If the population of the eart
免费考试题库
2019-12-17
10
问题
Passage 2If 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. foodB. oilC. spaceD. 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://ti.zuoweng.com/ti/U0glKKKQ
相关试题推荐
Passage2 Thatexperiencesinfluencesu
Passage2 Thatexperiencesinfluencesu
Passage2 Thatexperiencesinfluencesu
Passage1 Alyricisasubjectivepoem
Passage2 Ifthepopulationoftheeart
Passage2 Ifthepopulationoftheeart
Passage2 Ifthepopulationoftheeart
Passage1 AconceptcardevelopedbyJa
Passage1 AconceptcardevelopedbyJa
Passage1 AconceptcardevelopedbyJa
随机试题
下列制定法的形式中,属于部门规章的是()。
下列属于汽水共腾的处置措施是()。
甲公司发生下列交易事项中,应通过“其他综合收益”科目核算的有( )。
红景天的功效是
简要谈谈数学教学方法的选择依据的因素有哪些
共用题干 改革开放以来,我国经济快速增长,但是受亚洲金融危机影响,经济出现了许
大面积烧伤患者早期需大量输液,根据烧伤面积计算出的总液量(除外生理需要量,第1天
查找药物信息的正确顺序是()。A、一级信息源→二级信息源→三级信息源B、二级信息源→一级信息源→三级信息源C、二级信息源→三级信息源→一级信息源D、三级信
工程设计评审阶段,施工图设计评审的重点包括( )。A.使用功能是否满足质量目标和标准B.设计文件是否完整、齐全C.设计深度是否符合规定D.总平面布
某宗房地产的单价为每平方米建筑面积3000元,使用面积为建筑面积的60%,该宗房地产使用面积下的单价为()元。A.3000B.4600C.5