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
2024-06-10
23
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 Cart 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 mount 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 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.
选项
A、We will not have enough food to eat.
B、All the oil that drives our cars will be used up.
C、The earth will become too crowded.
D、There will be little water left on Earth.
答案
D
解析
该题问“下列那句文中没有提到?”文中提到"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 u
转载请注明原文地址:http://tihaiku.com/zcyy/3627657.html
相关试题推荐
【B1】[br]【B11】[originaltext]Nowwetraveltothenorthcentralpartofthe
【B1】[br]【B9】[originaltext]NowwetraveltothenorthcentralpartoftheU
【B1】[br]【B8】[originaltext]NowwetraveltothenorthcentralpartoftheU
【B1】[br]【B5】[originaltext]NowwetraveltothenorthcentralpartoftheU
【B1】[br]【B4】[originaltext]NowwetraveltothenorthcentralpartoftheU
【B1】[br]【B3】[originaltext]NowwetraveltothenorthcentralpartoftheU
【B1】[br]【B2】[originaltext]NowwetraveltothenorthcentralpartoftheU
[originaltext]Howdoyourisetothetopinbusiness?Whatpersonalqualitie
[originaltext]Howdoyourisetothetopinbusiness?Whatpersonalqualitie
[originaltext]W:Sam,couldyoureviewtheresultsofthesurveyonleisurespo
随机试题
用钢尺沿中心线垂直方向水平量取路基路面各部分的宽度,准确至0.001m。
下列几项中,不是脱疽病因的是A.吸烟 B.寒冻 C.免疫紊乱 D.激素紊乱
下列关于期货公司风险监督报表,正确的做法是()。A、期货公司风险监督报表的保存
多糖、蛋白质等水溶性大分子宜采用哪种方法进行分离A.酸碱沉淀法 B.水/醇法
男性病人,63岁,有心绞痛病史2年。1天前骑车上桥时又出现胸骨后压榨样疼痛,即原
下列哪项不是肺炎的叙述A.大叶性肺炎的致病菌多为肺炎链球菌 B.小叶性肺炎又称
现代培训按其性质可以分为()等层次的培训。A.经验培训 B.知识培训 C.
物业服务企业可根据自身镕况和园区需求提供的园区服务包括()。A:为入园企业提供工
(2014年真题)下列各项中,应计入销售费用的有()。A.销售商品发生的售后服
投资项目决策分析与评价的基本要求包括贯彻落实科学发展观、资料数据准确可靠和()
最新回复
(
0
)