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
金融经济
根据下列内容,回答196-200题。 If the population of the earth goes on increasing at its ...
根据下列内容,回答196-200题。 If the population of the earth goes on increasing at its ...
admin
2020-12-24
35
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.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://ti.zuoweng.com/ti/ark8KKKQ
相关试题推荐
根据课外活动的活动机能分,可分为()。A.群众性活动B.小组活动C.接受性括动D.创造性活动E.训练性活动
一堂好课的标准有()。A.目标明确B.内容正确C.方法得当D.组织严密E.体验积极
简述德育的内容。
“四书”、“五经”是我国()的教育内容。A.现代社会B.奴隶社会C.原始社会D.封建社会
一次测验后,教师发现一年级学生在加减法运算中常有进位数加错、看错数字等,教师根据学生的错误进行补救与指导,这种测验属于()。A.安置性测验B.形成性测验C.
____是根据教学大纲(或课程标准)编制的、系统反映学科内容的教学用书。
以下说法中,反映当代世界各国课程改革中所存在的一些共同的发展趋势的是()。A.重视课程的标准化建设B.重视课程内容的现代化、综合化C.重视基础学科和知识的结
古希腊把“三艺”作为教育内容,这“三艺”是指()。A.四书B.文法C.修辞D.辩证法E.论语
文化发展对学校课程产生的影响主要体现在()。A.内容的丰富B.增强国家对课程改革控制权C.课程结构的更新D.为课程改革提供物质基础E.课程改革由受教育者
简述小学德育具体目标的内容。
随机试题
下列除哪一项外均为喘证的特征 A.呼吸困难 B.张口抬肩 C.胸高胀满
瘦肉精学名盐酸克伦特罗,其结构简式如图l所示,盐酸克伦特罗能够发生的反应有()
下列哪项不属于输血并发症
小儿,3岁,于入院前曾与水痘患儿接触,应采取的措施是
()是指项目在整个计算期内,各年净现金流量现值累计等于零时的折现率。
ManypeoplewhoworkinLondonprefertoliveoutsideit,andtogointothe...
对期货投资方法及理念的专题分析对时效性要求不高。
质量事故技术处理方案核签后,监理工程师应对技术处理过程进行( )A.平行检查B.见证取样C.抽检D.跟踪检查
均质土坝坝面的质量检查和控制的关键是( )。A.铺土厚度B.土块大小C.杂质含量D.含水量
行政权力是指各级行政机关执行法律,制定和发布行政法规,在法律授权的范围内实现对公共事务的管理,解决一系列行政问题的强制力量与影响力,具有()的特征。A:实际性、