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
10
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.
CarlSagan believes that Venus might be colonized from earth because__________.
查看材料
选项
A.it might be possible to change its atmosphere
B.its atmosphere is the same as the earth's
C.there is a good supply of water on Venus
D.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/cHT8KKKQ
相关试题推荐
Passage2 Americanstodaydon′tplaceaveryhighvalueonintellect.Ourhe...
Passage2 Americanstodaydon′tplaceaveryhighvalueonintellect.Ourhe...
Passage2 Americanstodaydon′tplaceaveryhighvalueonintellect.Ourhe...
Passage2 Americansdon’tliketolosewars.Ofcourse,alotdependsonhowy...
Passage2 Americansdon’tliketolosewars.Ofcourse,alotdependsonhowy...
Passage2 Americansdon’tliketolosewars.Ofcourse,alotdependsonhowy...
Passage2 Americansdon’tliketolosewars.Ofcourse,alotdependsonhowy...
Passage2 Ofallthecomponentsofagoodnight′ssleep,dreamsseemtobe...
Passage2 ForcenturiesinSpainandLatinAmerica,headinghomeforluncha...
Passage2 ForcenturiesinSpainandLatinAmerica,headinghomeforluncha...
随机试题
正常人支/芳比值为 A.3.5~4.0 B.3.0~3.5 C.2.0~2
社会感染包括()。 A.群众性的感染 B.个体间的感染 C.大众传媒的感
《中华人民共和国合同法》对有关建设工程承包和分包的关系做出的规定包括()。
下肢静脉曲张形成的原因是
下列建设工程,不需申请消防设计审核的是( )。
上海中华进出口公司(加工贸易A类管理企业)从境外购进价值100000美元的涤纶
请选择某10kV用户配电所的避雷器,已知条件为:10kV电源为2路架空进线换电缆引入,10kV出线均为电缆,装有所用变压器,10kV电源侧为低电阻接地系...
下列事件中,满足结构适用性功能要求的有()。A、某建筑物遇到强烈地震,虽有局部损伤,但结构整体稳定B、某厂房在正常使用时,吊车梁出现变形,但在规范规定之
共同共有是一种重要的所有形态,下列选项中不属于共同共有的选项是()。A:合伙共有B:夫妻共有C:家庭共有D:遗产分割前共有
共用题干 HowtoGetAlongWellWithYourBoss1Beforeyouarguewithyourboss,c...