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
免费考试题库
2019-12-17
70
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.Man can eventually land on Venus only when__________.查看材料
选项
A.the algae have done their workB.the atmosphere becomes coolerC.there is oxygenD.it rains there
答案
D
解析
由最后一段中“before man can set foot on Venus it will be necessary for the oxygen to produce rain”可知,只有金星上有降雨,人类才最终有可能在上面着陆。所以正确答案为D。
转载请注明原文地址:https://ti.zuoweng.com/ti/yESlKKKQ
相关试题推荐
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
Passage2 Ifthepopulationoftheeart
Passage2 Ifthepopulationoftheeart
Passage2 Ifthepopulationoftheeart
随机试题
下列哪些内容属于流程无效造成银行内部流程风险的表现?() A.缺乏必要的流程
真菌人工培养的条件,正确的是 A.培养基中必须含有丰富的营养物质 B.最适p
患儿,男,11岁,自幼常有夜间遗尿,每晚有时一次至两次,需家人将其唤醒,形体较瘦
下列险种中,属于海上货物运输保险基本险的险种有()。[2008年真题] A
以下哪种牙体缺损不能用充填的方法治疗()A.后牙面洞B.前牙切角缺损C.需抬高咬合D.后牙邻洞E.楔状缺损
()主要强调的是员工应该承担工作的内容和要求,而不是工作任务的地点和时空条件A.职务B.职责C.职位D.岗位
下列不属于增加商业银行二级资本方法的是()。A.发行可转换债券B.提高超额贷款损失准备C.发行长期次级债券D.提高留存利润
下列各项中,符合内部审计人员职业道德要求的是( )。A.不得从事损害所在组织利益的活动B.保持合理的职业谨慎,并合理使用职业判断C.在履行职责时,做到独立、
某公司发行可转换债券,每张面值为1000元,转换比率为20,则该可转换债券的转换价A、20B、50
(2017年)甲公司2015年和2016年的销售净利率分别为10%和12%,总资产周转率分别为6和5,假定资产负债率保持不变。则与2015年相比,甲公司2...