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
书海库
2019-12-17
66
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.CarlSagan believes that Venus might be colonized from earth because__________.查看材料
选项
A.it might be possible to change its atmosphereB.its atmosphere is the same as the earth'sC.there is a good supply of water on VenusD.the days on Venus are long enough
答案
A
解析
由第二段第一句中的“itwill be possible to change the atmosphere ofVenus and so create a new worl d”可知.so是表示因果的连接词,前因后果,所以正确答案A。
转载请注明原文地址:https://ti.zuoweng.com/ti/XESlKKKQ
相关试题推荐
请阅读Passage2,完成第小题。 Passage2 Crash.S
请阅读Passage2,完成第小题。 Passage2 Crash.S
请阅读Passagel,完成第小题。 Passage1 Jatender
请阅读Passagel,完成第小题。 Passage1 Jatender
请阅读Passage2。完成第小题。 Passage2 TheWorld
请阅读Passage2。完成第小题。 Passage2 TheWorld
请阅读Passage2。完成第小题。 Passage2 TheWorld
Passage2 Ifthepopulationoftheeart
Passage2 Ifthepopulationoftheeart
Passage2 Ifthepopulationoftheeart
随机试题
多年冻土地区的公路路基最常遇到的病害问题是( )。 A.滑坡 B.冻胀 C
27.根据特许者对被特许者的控制程度,可将特许经营分为()。 A.单一特许经
共用题干 某公司是一家具有一定规模的民营企业,属于特种行业,管理基础较为薄弱.
城市详细规划阶段的内容不包括()。 A.预测规划区各类通信需求量 B.
某市交通管理局发布文件,规定对髙速公路过往车辆征收过路费。李某驾车路过被征收,他
患儿,6岁,出生后反复呼吸道感染,平时较少活动。体检:无发绀,心前区隆起,于胸骨
奥苏伯尔根据两个维度,对认知领域的学习进行了分类。一个维度是学习进行的方式,学习
测验项目对所测量的属性或品质的鉴别能力是()。 A.信度B.效度C.区分
国家二级保护野生药材物种为 A.资源严重减少的主要常用野生药材物种 B.资源
金融期货交易制度中的逐日盯市制度又被称为()。A.每日价格波动限制及断路器规则B.保证金制度C.结算所和无负债结算制度D.集中交易制度