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
昕玥
2019-12-17
11
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.On Venus there is a lot of__________.
选项
A. waterB. carbon dioxideC. carbon monoxideD. oxygen
答案
B
解析
由第--f&的最后一句话中的“there is only a tiny amount ofwater there(Venus)”得知,A选项错误。第三段结尾说明,藻类通过火箭运往金星,然后“In a fairly short time,the algae will break down the carbon dioxide into oxygen and carbon”.说明金星上有大量的二氧化碳。C和D选项错误。故选B。
转载请注明原文地址:https://ti.zuoweng.com/ti/t0glKKKQ
相关试题推荐
Passage2 Thatexperiencesinfluencesu
Passage2 Thatexperiencesinfluencesu
Passage2 Thatexperiencesinfluencesu
Passage1 Alyricisasubjectivepoem
Passage1 Alyricisasubjectivepoem
Passage2 Ifthepopulationoftheeart
Passage1 AconceptcardevelopedbyJa
Passage1 AconceptcardevelopedbyJa
Passage1 AconceptcardevelopedbyJa
Passage1 AconceptcardevelopedbyJa
随机试题
张元素称之为“疮家圣药”的药物是 A.白芷 B.连翘 C.天花粉 D.败
物业管理区域内的道路、场地是为业主共同利益而建设的,不得擅自占用或挖掘,确需临时
上市公司有下列情形之一的,由证券交易所决定暂停其股票上市交易。( )
物业管理的基础是()的财产权。
包工头张某借用某施工企业的资质与甲公司签订-建设工程施工合同。施工结束后,工程竣
上盘相对上移,下盘相对下移的断层是: A.正断层B.平移断层C.走向断层
A.正视 B.近视散光 C.远视 D.散光 E.老视眼球在不同子午线上屈光力不同,形成两条焦线属于
呈纺锤形,两端略尖。表面黄白色或淡黄色,有细纵皱纹。质柔韧,断面黄白色,半透明,中柱细小的药材是A:天冬B:山麦冬C:麦冬D:百部E:射干
货币政策工具中的直接信用控制工具主要包括()。A:信用配额B:道义劝告C:直接干预D:流动性比率E:利率最高限
到1957年,国家先后批准的15个城市的总体规划和部分详细规划的城市不包括()。A:郑州B:洛阳C:济南D:成都