2015年职称英语理工类A级阅读理解练习(3)_职称英语阅读理解

　　warning systems at both lakes. If the gas pressure rises to a dangerous level，computers will set

　　off loud sirensand bright lights to warn the people in the villages.That way, they will

　　have time to escape from the dangerous gases.

　　41 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.

　　42 Which of the following statements about Lake Nyos and Lake Monoun is true?

　　A They were formed in 1984.

　　B They are at the top of two active volcanoes.

　　C They are not like most other crater lakes.

　　D Water in them turns over regularly.

　　43 Lake Nyos and Lake Monoun explode because

　　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

　　44 A team of scientists has

　　A erected a pressure-releasing pipe in the lake

　　B identified the gases at the bottom of the lake

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