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
Loveyou
2019-12-17
14
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__________.
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/q0glKKKQ
相关试题推荐
Passage2 Thatexperiencesinfluencesu
Passage2 Thatexperiencesinfluencesu
Passage1 Alyricisasubjectivepoem
Passage1 Alyricisasubjectivepoem
Passage2 Ifthepopulationoftheeart
Passage2 Ifthepopulationoftheeart
Passage2 Ifthepopulationoftheeart
Passage1 AconceptcardevelopedbyJa
Passage1 AconceptcardevelopedbyJa
Passage1 AconceptcardevelopedbyJa
随机试题
6岁患儿右侧股骨头缺血性坏死,右髋出现疼痛、跛行,舌质可紫黯或舌有瘀斑,脉弦涩。
在SPECT显像中,衰减校正的最佳方法是 A.几何平均法 B.算术平均法
关于职业道德建设,正确的说法是()。 A.职业道德建设是制约和控制员工的基本
(2010年)在行政诉讼中,人民法院审查(???),属于对证据真实性的审查。
饭店创新的阻力有很多种,下列不属于饭店创新阻力的是()。
航路导航台的主要设备为()。A.无方向性信标B.仪表着陆系统C.全向信标D.二次雷达
谋求世界各国经济共同发展的根本途径是()。A.加速各国经济结构的调整B.推动南北对话C.加强南南合作D.建立公正、合理、平等、互利的国际经济新秩序
下列关于营改增应税行为的表述中,正确的有( )。A.以货币资金投资收取的固定利润或者保底利润,按照贷款服务缴纳增值税B.拍卖行受托拍卖取得的手续费或佣金收入,
下述类型的骨折中,最不稳定的是A嵌插骨折B螺旋形骨折C横形骨折D青枝骨折E裂缝骨折
减少左旋多巴不良反应并增加其疗效的药物是A.苯妥英钠B.苯巴比妥C.乙琥胺D.卡比多巴E.维生素B6