首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
The Exploding Lakes of Cameroon What comes to mind when you think of a lake? You probably imagine a pretty scene with blue w
The Exploding Lakes of Cameroon What comes to mind when you think of a lake? You probably imagine a pretty scene with blue w
admin
2014-03-13
67
问题
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 pipe 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.
What do we learn from the last paragraph?
选项
A、Scientists are planning to install pipes in all crater lakes.
B、Scientists still do not know how to prevent gas explosions.
C、Explosion disasters could be avoided in the future.
D、Warning systems have been set up in the villages nearby.
答案
C
解析
前文表明,湖里竖起若干根减小湖底压强的管子后,就不会再有毒气喷发的危险。最后一段又说在这些管子都到位前科学家在这两个湖附近安装了早期预警系统,以便人们有时间逃离这些有毒气体。由此可知,这种有毒气体喷发的灾难在未来可以避免。
转载请注明原文地址:https://kaotiyun.com/show/toGd777K
本试题收录于:
职称英语理工类A级题库职称英语分类
0
职称英语理工类A级
职称英语
相关试题推荐
DriedFoodsCenturiesago,mandiscoveredthatremovingmoisture(51)foodhelpedtopreserveit,andthattheeasiestwaytodot
Poorschoolingwastherootoftheunemploymentproblem.
Whatcountryhasmorehighest-ratingcompaniesintheworldthananyothercountryhas?WhatdoesthefoundingoftheWattsHum
WhichofthefollowingisNOTtrueoftheJapanese?WhichofthefollowingisNOTtrueofBritain?
EyeMovementandSeveralFaultsinReadingSupposeyoudothisexperimentwithafriend.Getholdofabookwithalargepag
MadScientistStereotypeOutdatedDopeoplestillimagineaphysicistasabeardedmaninglassesorhastheimageofthema
A.GoodresultsB.AnancientskillC.GainingattentionD.MemorytricksE.AlectureonmemorytechniquesF.Waystoimpr
Thechildrentrembledwithfearwhentheysawthepoliceman.
EmploymentOpinionpollsarenowbeginningtoshowanunwillinggeneralagreementthat,whoeveristoblameandwhateverha
Neighboringstatesoftensigntradeagreementswithoneanother.
随机试题
鞘膜积液最常见的情况是:()
乳癌患者乳房皮肤出现“橘皮样”改变是由于
商标的主体不包括()。
某银行某日超额准备金短缺,通过同业市场拆借资金,当日挂牌利率为9.925%,拆出资金200万元,期限为1天;固定上浮比率为0.075%,拆入到期利息为()元。
甲向乙借款20万元做生意,由丙提供价值15万元的房屋抵押,并订立了抵押合同,但未办理登记手续。甲又以自己的一辆价值6万元的汽车质押给乙,双方订立了质押合同。乙认为将车放在自家附近不安全,决定仍放在甲处。对此,下列说法中,错误的有()。
下列选项中,属于要约的是()。
(重庆选调2010—81)A、B、C、D四人进行篮球传接球练习,要求每人接球后再传给别人。开始由A发球,并作为第一次传球,若第三传球后,球又回到A手中。则传球方式共有几种?()
平均利润率的形成是
Warmaybeanaturalexpressionofbiologicalinstinctsanddrivestowardaggressioninthehumanspecies.Natural(1)_____ofa
Tomcouldhardly______hisexcitementasheknewthathehadmadearealdiscovery.
最新回复
(
0
)