首页
登录
职称英语
[originaltext] If the population of the Earth goes on increasing at its pres
[originaltext] If the population of the Earth goes on increasing at its pres
游客
2023-09-10
58
管理
问题
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.
An American scientist, Professor Carl 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, an organism that 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 than 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.
选项
A、They can be bred in any conditions.
B、They produce oxygen.
C、They can easily be carried in spaceships.
D、They are organisms.
答案
B
解析
该题问“为什么海藻对在金星位人很重要?”文章中作者提到“Segan proposes that algae, organism that 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.”。因此,B项“它们产生氧气”为正确答案。
转载请注明原文地址:https://tihaiku.com/zcyy/3002635.html
相关试题推荐
[originaltext]Doyouhavetroublesleepingatnight?Thenmaybethisisfor
[originaltext]Doyouhavetroublesleepingatnight?Thenmaybethisisfor
[originaltext]Tomostofussharksarethemostdangerousfishintheseaa
[originaltext]Tomostofussharksarethemostdangerousfishintheseaa
[originaltext]Chinesecharacters.evolvedfrompicturesandsigns,andthe
[originaltext]Chinesecharacters.evolvedfrompicturesandsigns,andthe
[originaltext]W:Ithinkweoughttoturnaroundandheadbackdownthetrail.
[originaltext]W:Ithinkweoughttoturnaroundandheadbackdownthetrail.
[originaltext]M:Ifyoucanmakeupyourmindaboutthecolor,Icanmartonth
[originaltext]M:Ifyoucanmakeupyourmindaboutthecolor,Icanmartonth
随机试题
ShoppingandtheInternet,MakingItClick[A]TerryLundgren
【B1】[br]【B5】A、imaginationB、predictionC、informationD、outlineC原句中Inaddition
(1)IwassurethatIhadfoundatlasttheonetruecosmopolitesinceAdam,
TheRightAmountofEnergyWeallenjoybeing
由柴可夫斯基作曲的古典芭蕾舞剧是()A.《天鹅湖》 B.《普罗米修斯》
某企业被依法宣告破产后,经拨付破产费用和共益债务后,破产财产合计3亿元。该企业所
简述静力性工作和动力性工作的特点,并举例说明。
症见恶风发热.汗出头痛,鼻鸣干呕,苔白不渴,脉浮缓或浮弱,应选用的方剂是A.桂
培训前期评估的环节包括( )。A.培训环境评估 B.培训对象工作成效及行为评
苯二氮(艹卓)类药物中毒的特异性治疗药物为A.氟马西尼 B.去甲肾上腺素 C
最新回复
(
0
)