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【单选题】

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 tapped 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 pr 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 erous level, computers will set off loud sirens (警报) and bright lights to warn the people in the villages. That way, they will have time to escape from the erous gases. The Exploding Lakes of CameroonWhat 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.
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【单选题】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,...

A.
the gases rise to the top and mix with air.
B.
people from the villages turn over the water.
C.
scientists have put in a computer system.
D.
they have more gases trapped at the bottom than other crater lakes.

【单选题】滑坡的形成条件

A.
断裂
B.
较大坡度
C.
暴雨
D.
融雪

【单选题】新滩滑坡是一个( )滑坡。

A.
堆积层滑坡
B.
浅层滑坡
C.
反坡向滑坡
D.
块状岩体滑坡

【多选题】判别滑坡的标志包括( )。

A.
岩土结构方面的标志,如岩土体扰动松脱现象、产状不连续现象、新老地层倒置现象等
B.
地物地貌标志,如圈椅状或马蹄状地形、鼻状凸丘、多级平台、双沟同源、醉汉林、马刀树等
C.
滑坡边界及滑床标志,如滑坡后缘断壁上的擦痕等
D.
水文地质标志,如坡脚处呈串珠状分布的渗水点、泉点、陡坎下部呈线状分布的下降泉等

【多选题】整治滑坡的原则是()。

A.
治早
B.
治小
C.
一次根治
D.
不留后患
E.
绕避
相关题目:
【单选题】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,...
A.
the gases rise to the top and mix with air.
B.
people from the villages turn over the water.
C.
scientists have put in a computer system.
D.
they have more gases trapped at the bottom than other crater lakes.
【单选题】滑坡的形成条件
A.
断裂
B.
较大坡度
C.
暴雨
D.
融雪
【单选题】新滩滑坡是一个( )滑坡。
A.
堆积层滑坡
B.
浅层滑坡
C.
反坡向滑坡
D.
块状岩体滑坡
【多选题】判别滑坡的标志包括( )。
A.
岩土结构方面的标志,如岩土体扰动松脱现象、产状不连续现象、新老地层倒置现象等
B.
地物地貌标志,如圈椅状或马蹄状地形、鼻状凸丘、多级平台、双沟同源、醉汉林、马刀树等
C.
滑坡边界及滑床标志,如滑坡后缘断壁上的擦痕等
D.
水文地质标志,如坡脚处呈串珠状分布的渗水点、泉点、陡坎下部呈线状分布的下降泉等
【多选题】整治滑坡的原则是()。
A.
治早
B.
治小
C.
一次根治
D.
不留后患
E.
绕避
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