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
43
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__________.
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/YGT8KKKQ
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 Ofallthecomponentsofagoodnight′ssleep,dreamsseemtobe...
Passage2 Ofallthecomponentsofagoodnight′ssleep,dreamsseemtobe...
Passage2 ForcenturiesinSpainandLatinAmerica,headinghomeforluncha...
Passage2 ForcenturiesinSpainandLatinAmerica,headinghomeforluncha...
随机试题
湿陷性黄土浸水湿陷的主要原因为下列哪个选项( )
生殖技术引起的社会伦理问题有
不适合作为初中生“设计·应用”学习领域评价要点的是( )。
矫正社会工作在一些国家和地区也称感化工作,它是矫正制度中非常重要的组成部分,是社
埃里克森提出了(),指个体组织自己的动机、能力、信仰及其活动经验而形成
赵某是A市某三级甲等医院的呼吸内科主任,在执业过程中多次收受某药品生产企业给予
WISC的适用范围是()。 A.6~16岁的少年儿童 B.成年人 C.儿童和成年人 D.老年人
理想的口腔条件应具备的条件,不包括A.足够的骨组织支持牙,无尖锐的骨突或骨崎B.无妨碍义齿就位的倒凹或悬突C.与影响牙稳定、固位的瘢痕结构,增生的软组织和系
某新建设项目建筑面积5000m2,按概算指标和地区材料预算单价等算出一般土建工程单位造价为1200元(其中,人、料、机费用1000元,综合费率20%)。但...
下列有关函证银行存款目的的说法中,正确的有()。A.银行借款的金额是否正确B.是否存在企业未人账的银行借款C.银行存款是否存在D.结合财务费用审计测算利息