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.
40 The 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.
第三篇
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 thirtyseven 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 waterturns overregularly.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.
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