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
共用题干 第二篇The Exploding Lakes of CameroonWhat comes to mind when you think of ...
共用题干 第二篇The Exploding Lakes of CameroonWhat comes to mind when you think of ...
admin
2020-12-24
16
问题
共用题干
第二篇
The Exploding Lakes of Cameroon
What comes to mind when you think of a lake?You probably imagine a pretty scene with blue water,birds,and fish.For the people in the northwestern Cameroon,however,the image is very different. For them,lakes may mean terrible disasters.In 1984,poisonous gases exploded out of Lake Monoun and came down into the nearby villages,killing thirty-seven people.Two years later,Lake Nyos erupted.A cloud of gases rolled down the hills and into the valleys and killed 1,700 people.
Lake Nyos and Lake Monoun are crater(火山口)lakes. They were formed when water collected in the craters of old volcanoes.The volcanoes under Lake Nyos and Lake Monoun are not active anymore.However,poisonous gases from the center of the earth continue to flow up through cracks in the bottom of the lake.This is normal in a crater lake.In most crater lakes,these gases are released often because the water"turns over"regularly.That is,the water from the bottom of the lake rises and mixes with the water at the top,allowing the gases to escape slowly.
However,in Lakes Nyos and Monoun,there is no regular turning over. No one knows the reason for this fact,but as a result,these lakes have more gases trapped at the bottom than other crater lakes.In fact,scientists who have studied Lakes Nyos and Monoun have found 16,000 times more gases. When a strong wind , cool weather, a storm, or a landslide(滑坡)causes the water to turn over suddenly,the gases escape in a violent explosion.
In the past,no one knew when the gases might explode,so there was no way for the villagers to escape disaster. Now scientists from the United States,France,and Cameroon have found a way to reduce the gas pressure at the bottom of Lake Nyos.They stood a 672-foot plastic pipe in the middle of the lake,with one end of the pipe near the bottom and the other end in the air. Near the top of the pipe,the team put several holes that could be opened or closed by a computer. Now,when the gas pressure gets too high,the holes are opened and some of the gas-filled water shoots up through the nine into the air like a fountain.With less pressure,a disastrous explosion is much less likely.However,the scientists are not sure that one pipe will be enough to prevent explosions.They hope to put in others soon and they plan to install a similar pipe and a computer system at Lake Monoun as well.
To protect people nearby until all of the pipes are in place,the scientists have installed early warning systems at both lakes.If the gas pressure rises to a dangerous level,computers will set off loud sirens(警报)and bright lights to warn the people in the villages. In that way,they will have time to escape from the dangerous gases.
选项
What will happen when Lake Nyos and Lake Monoun explode?
A:Water will flow down the hills.
B:Poisonous gases will be released suddenly.
C:A strong wind will rise from the lakes.
D:The volcanoes will come to life.
答案
B
解析
第一段提到,“ poisonous gases exploded out of Lake Monoun”,所以选B,有毒气体会突然喷发。
选项A、B和D的信息不完整或者错误,第二段和第三段开头分别提到 “They were formed when water collected in the craters of old volcanoes…there is no regular turning over”,这是两个湖与众不同的地方,所以选C。
第三段说到两个湖时,提到“these lakes have more gases trapped at the hottom than other crater lakes”,这就是湖泊爆炸的原因。
文章第四段第三句提到科学家们“stood a 672-foot plastic pipe in the middle of the lake ” , “ erect”和“stand”为同义词,表示“树立、立起”。
最后一段提到“the scientists have installed early warning systems at both lakes”,看来灾难是可防可控的,因此选D。
转载请注明原文地址:https://ti.zuoweng.com/ti/soMQKKKQ
相关试题推荐
共用题干 EconomicReforminChinaMoreUSsinologistshaveexpressedconfidencei...
共用题干 EconomicReforminChinaMoreUSsinologistshaveexpressedconfidencei...
共用题干 EconomicReforminChinaMoreUSsinologistshaveexpressedconfidencei...
共用题干 EconomicReforminChinaMoreUSsinologistshaveexpressedconfidencei...
共用题干 EconomicReforminChinaMoreUSsinologistshaveexpressedconfidencei...
共用题干 EconomicReforminChinaMoreUSsinologistshaveexpressedconfidencei...
共用题干 TheJoyofLivingAloneMoreandmoreAmericansarelivingalone.Someli...
共用题干 TheJoyofLivingAloneMoreandmoreAmericansarelivingalone.Someli...
共用题干 TheJoyofLivingAloneMoreandmoreAmericansarelivingalone.Someli...
共用题干 TheJoyofLivingAloneMoreandmoreAmericansarelivingalone.Someli...
随机试题
关于个人理财业务,下列说法不正确的是()。 A、个人理财业务的发展与市场条件没
开发区区域环境影响评价的重点之一是从( )角度论证开发区环境保护方案,包括污染
关于染色体DNA复制的一般特征,下列描述不正确的是 A.半保留复制 B.形成
脏器损伤后,以腹膜炎为主要表现,该损伤脏器是
能够创造商品所有权效用的活动是()。
下列各项,不属月经先期脾气虚证的主要证候是
公众参与的价值在于提高项目的科学性和可行性。公众的环境健康是最重要的,任何一个新
患者,女性,30岁。诊断再生障碍性贫血。血常规显示红细胞3.OX1012/L,血红蛋白60g/L,白细胞2.8X109/L,血小板80X109L,该患者...
微分方程cosydx+(1+e-x)sinydy=0满足初始条件yx=0=π/3的特解是()。
急性蜂窝织炎性阑尾炎的病变特点是A.阑尾全层弥漫性中性粒细胞浸润B.阑尾黏膜坏死伴中性粒细胞浸润C.阑尾壁纤维组织增生伴慢性炎细胞浸润D.阑尾腔闭塞,远端