What will happen when Lake Nyos and Lake Monoun explode、

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• 1The 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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• 2During 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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• 3Scientists at Carnegie Menon University tried to find out

  A.why office doors were often 1eft open．

  B.when it was a good time to turn off the computer．

  C.what questions office workers were bothered with．

  D.which behaviors could tell whether a person was busy

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• 4The behavior sensor and software system built in a phone

  A.could help store messages．

  B.could send messages instantly

  C.could tell when it is wise to interrupt you．

  D.could identify important phone calls．

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• 5A big problem facing people today is that

  A.they must tolerate phone disturbances or miss important calls．

  B.they must turn off their phones to keep their homes quiet．

  C.they have to switch from a desktop phone to a cellphone．

  D.they are too busy to make phone calls．

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• 6Which 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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• 7Lake 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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• 8A team of scientists has

  A.erected a pressure-releasing pipe in the lake

  B.identified the gases at the bottom of the lake

  C.built a beautiful fountain near the lakes

  D.removed all dangerous gases from the lakes

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• 9What 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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