職稱英語理工類的A級閱讀理解練習

　　The Exploding Lakes of Cameroon　　What comes to mind when you think of a lake? You probably imagine a pretty scene with　　very different. For them，lakes may mean terrible disasters. In 1984，poisonous gases exploded　　years later,Lake Nyos erupted A cloud of gases rolled down the hills and into the valleys and　　Lake Nyos and Lake Monoun are craterlakes They were formed when water　　not active anymore. However, poisonous gases from the center of the earth continue to flow up　　gases are released often because the waterturns overregularly.That is，the water from the　　However，in Lakes Nyos and Monoun，there is no regular turning over.No one knows the　　crater lakes. In fact，scientists who have studied Lakes Nyos and Monoun have found 16,000　　water to turn over suddenly，the gases escape in a violent explosion.　　to escape disaster. Now scientists from the United States，France，and Cameroon have found a　　the middle of the lake，with one end of the pipe near the bottom and the other end in the air.Near　　when the gas pressure gets too high，the holes are opened and some of the gas-filled water shoots　　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.　　warning systems at both lakes. If the gas pressure rises to a dangerous level，computers will set　　have time to escape from the dangerous gases.　　A Water will flow down the hills　　C A strong wind will rise from the lakes　　42 Which of the following statements about Lake Nyos and Lake Monoun is true?　　B They are at the top of two active volcanoes.　　D Water in them turns over regularly.　　A the gases rise to the top and mix with air.　　C scientists have put in a computer system.　　44 A team of scientists has　　B identified the gases at the bottom of the lake　　D removed all dangerous gases from the lakes　　A Scientists are planning to install pipes in all crater lakes.　　C Explosion disasters could be avoided in the future

　　The Exploding Lakes of Cameroon　　What comes to mind when you think of a lake? You probably imagine a pretty scene with　　very different. For them，lakes may mean terrible disasters. In 1984，poisonous gases exploded　　years later,Lake Nyos erupted A cloud of gases rolled down the hills and into the valleys and　　Lake Nyos and Lake Monoun are craterlakes They were formed when water　　not active anymore. However, poisonous gases from the center of the earth continue to flow up　　gases are released often because the waterturns overregularly.That is，the water from the　　However，in Lakes Nyos and Monoun，there is no regular turning over.No one knows the　　crater lakes. In fact，scientists who have studied Lakes Nyos and Monoun have found 16,000　　water to turn over suddenly，the gases escape in a violent explosion.　　to escape disaster. Now scientists from the United States，France，and Cameroon have found a　　the middle of the lake，with one end of the pipe near the bottom and the other end in the air.Near　　when the gas pressure gets too high，the holes are opened and some of the gas-filled water shoots　　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.　　warning systems at both lakes. If the gas pressure rises to a dangerous level，computers will set　　have time to escape from the dangerous gases.　　A Water will flow down the hills　　C A strong wind will rise from the lakes　　42 Which of the following statements about Lake Nyos and Lake Monoun is true?　　B They are at the top of two active volcanoes.　　D Water in them turns over regularly.　　A the gases rise to the top and mix with air.　　C scientists have put in a computer system.　　44 A team of scientists has　　B identified the gases at the bottom of the lake　　D removed all dangerous gases from the lakes　　A Scientists are planning to install pipes in all crater lakes.　　C Explosion disasters could be avoided in the future