A team of scientists has

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• 1Lake 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

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• 2Which 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．

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• 3What will happen when Lake Nyos and Lake Monoun explode、

  A.Water will flow down the hills

  B.Poisonous gases will be released suddenly．

  C.strong wind will rise from the lakes

  D.The volcanoes will come to life．

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• 4The computer performed better than people in the study because

  A.the computer worked harder．

  B.the computer was not busy

  C.people tended to be biased．

  D.people were not good at statistics．

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• 5During the experiment，the subjects were asked

  A.to control the sensors and the camera．

  B.to rate the degrees to which they could be interrupted．

  C.to compare their behaviors with others’．

  D.to analyze all the indicators of interruption．

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• 6What do we learn from the last paragraph、

  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．

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