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
根据下列内容,回答196-200题。 If the population of
根据下列内容,回答196-200题。 If the population of
Freeti
2019-12-17
54
问题
根据下列内容,回答196-200题。If the population of the earth goes on increasing at its present rate, there will eventually notbe enough resources left to sustain life on the planet. By the middle of the 21st century, if presenttrends continue, we will have used up all the oil that drives our cars, for example. Even if scien-tists develop new ways of feeding the human race, the crowded conditions on earth will make itnecessary for us to look for open space somewhere else. But none of the other planets in our solarsystem 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 tochange the atmosphere of Venus and so create a new world almost as large as earth itself. The dif-ficulty 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 andat the same time produce oxygen, should be bred in conditions similar to those on Venus. As soonas this has been done, the algae will be placed in small rockets. Spaceships will then fly to Venusand fire the rockets into the atmosphere. In a fairly short time, the algae will break down the car-bon dioxide into oxygen and carbon.When the algae have done their work, the atmosphere will become cooler, but before mancan set foot on Venus it will be necessary for the oxygen to produce rain. The surface of the planetwill still be too hot for men to land on it but the rain will eventually fall and in a few years some-thing like earth will be reproduced on Venus.In the long run, the most difficult problem caused by population growth on earth willprobably 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/UZ49KKKQ
相关试题推荐
在“细胞核是遗传信息库”内容的教学设计时,教师在互联网上搜索到部分有利于学生学习
《普通高中生物课程标准(实验)》中,关于“光合作用的原理和应用”的具体内容要求是
材料: “生态系统的能量流动”一节的教学内容是在前一节生态系统概念、范围、结构
教师在“种群数量的变化”这一内容的教学中,创设问题情境、讨论分析大草履虫种群数量
材料: 我国某版本生物教材中关于绿叶中色素的提取和分离内容如下:
在学习“尿的形成与排出”这一内容时,为确保教学进度,教师只选择平时表现较好的学生
客户家庭财务状况信息的内容,主要包括()。
客户引导是综合理财规划服务中一项非常重要的内容。以下选项中关于客户引导技巧说法错
在家庭财务保障规划建议中,理财师在为客户进行风险管理效果评估时,其内容不包括(
理财师的服务是“持续”的且服务方式是多样的,下列选项中属于理财规划服务的内容的是
随机试题
患者林某,两手指及右下肢麻木、刺痛、怕冷两年,每遇阴冷加重,少事活动反觉舒服,但
工程项目从立项到投产使用要经历六个阶段,每个阶段都要控制施工的安全和环境问题,这
亲水性生物碱最易溶于 A二氯甲烷B三氯甲烷C乙醚D乙醇
C
《安全生产法》规定,因生产安全事故受到损害的从业人员,除依法享有工伤社会保险外,
根据国务院《关于开展城镇居民基本医疗保险试点的指导意见》,下列具有城市户籍的人员
用于方案综合评价的方法有很多,常用的定性方法有()。
关于胰岛素的说法中,不正确的是
知识点:胎心率E宫缩时 过期妊娠,羊水过少时,胎心电子监护胎心率变化可能是
支气管肺炎合并急性心衰的诊断依据是 A.呼吸、心率突然增快 B.极度烦