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
职称考试
Passage 2 If the population of the earth goes on increasing at its present r...
Passage 2 If the population of the earth goes on increasing at its present r...
admin
2020-12-24
15
问题
Passage 2
If 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.
Algae are plants that can__________.
查看材料
选项
A.live in very hot temperatures
B.live in very cold temperatures
C.manufacture oxygen
D.all of the above
答案
D
解析
由第三段的第一句“Sagan proposes that algae organisms,which can live in extremely hot or cold atmospheres and at the same time produce oxygen”可知,A、B、C均正确,所以选D。
转载请注明原文地址:https://ti.zuoweng.com/ti/XHT8KKKQ
相关试题推荐
Passage2 Americanstodaydon′tplaceaveryhighvalueonintellect.Ourhe...
Passage2 Americanstodaydon′tplaceaveryhighvalueonintellect.Ourhe...
Passage2 Americanstodaydon′tplaceaveryhighvalueonintellect.Ourhe...
Passage2 Americanstodaydon′tplaceaveryhighvalueonintellect.Ourhe...
Passage2 Americansdon’tliketolosewars.Ofcourse,alotdependsonhowy...
Passage2 Americansdon’tliketolosewars.Ofcourse,alotdependsonhowy...
Passage2 Ofallthecomponentsofagoodnight′ssleep,dreamsseemtobe...
Passage2 Ofallthecomponentsofagoodnight′ssleep,dreamsseemtobe...
Passage2 Ofallthecomponentsofagoodnight′ssleep,dreamsseemtobe...
Passage2 ForcenturiesinSpainandLatinAmerica,headinghomeforluncha...
随机试题
热极深伏,阳热内结而出现寒象的病机变化,属于
某人以8%单利借出15000元,借款期为3年;此后以7%的复利将上述借出资金的本
关于给水排水工程中砌筑结构对材料的基本要求,正确的有()。 A.机制烧结砖应边
更换机车或更换乘务组时,应对列车自动制动机进行全部试验。
慢性宫颈炎的治疗方法中最适宜的是A:阴道冲洗B:早期手术治疗C:激光治疗D:全身大剂量应用抗生素E:局部涂硝酸银
举重运动员使用后,可短时间内急速降低体重,因此需按兴奋剂管理的药物是()A.缬沙坦B.呋塞米C.普茶洛尔D.硝苯地平E.卡托普利
()是指项目监理机构在施工单位自检的同时,按照有关规定、建设工程监理合同约定对同一检验项目进行的检测试验活动。A.巡视B.平行检验C.旁站D.见证取样
不动产登记代办中的资料核验包括( )。A.户内查验B.附带动产查验C.身份核验D.不动产权属证书核验E.不动产权属状况核验
房地产具有保值增值特性,真正的房地产自然增值是由于()引起的。A:装饰装修改造B:通货膨胀C:需求增加导致稀缺性增加D:改进物业管理
作为资本市场的直接金融机构,投资银行有()的基本功能。A:媒介资金供求B:构造证券市场C:优化资源配置D:促进产业集中E:促进信息交流