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
16
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.
On Venus there is a lot of__________.
查看材料
选项
A.water
B.carbon dioxide
C.carbon monoxide
D.oxygen
答案
B
解析
由第--f&的最后一句话中的“there is only a tiny amount ofwater there(Venus)”得知,A选项错误。第三段结尾说明,藻类通过火箭运往金星,然后“In a fairly short time,the algae will break down the carbon dioxide into oxygen and carbon”.说明金星上有大量的二氧化碳。C和D选项错误。故选B。
转载请注明原文地址:https://ti.zuoweng.com/ti/2HT8KKKQ
相关试题推荐
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 Ofallthecomponentsofagoodnight′ssleep,dreamsseemtobe...
Passage2 ForcenturiesinSpainandLatinAmerica,headinghomeforluncha...
Passage2 ForcenturiesinSpainandLatinAmerica,headinghomeforluncha...
随机试题
下列疏散出口的检查结果中,不符合现行国家消防技术标准的是() A.容纳200人
下列各项属于包价旅游产品成本的有()。
最早提出班级授课制的教育家是()。
关于神经冲动传导的叙述,正确的是()。
关于火车票遗失补办的说法中,正确的是()。
棉花期货的多空双方进行期转现交易。多头开仓价格为10210元/吨,空头开仓价格为
黄疸与萎黄的鉴别要点是( ) A.身黄 B.目黄 C.小便黄 D.兼见
阻塞性肺气肿最基本的发病机制是A.肺泡间血流减少B.αl—AT缺乏C.肺小血管痉孪D.分泌物所致单向活瓣作用E.支气管炎症致细支气管不完全阻塞
某服装厂工人的劳动强度指数经过测定为21,按照我国体力劳动强度分级方法,该工人的劳动强度属于A.Ⅰ级B.Ⅱ级C.Ⅲ级D.Ⅳ级E.Ⅴ级
在贷款项目环境条件分析中,银行对项目环境保护的治理方案进行审查的内容不包括()。A.对投入物、燃料和原材料的使用是否安排了处理措施,是否采取了治理措施B.经