单项选择题

The author implies that the behavior of the dominant male rats is sometimes parallel with that of ______.

A．cruel, powerful people
B．people who abandon their children
C．hyperactive people
D．people who would like to keep to themselves
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单项选择题
Which of the following inferences CANNOT be made from the information in the first paragraph
A．Calhoun's experiment is still considered important today.
B．Overpopulation causes pathological behavior in rat populations.
C．Stress does not occur in rat communities unless there is overcrowding.
D．Calhoun had experimented with rats before.
单项选择题
Rivera's investigation and expose on the conditions at Willowbrook State School led to ______.
A．the public concern and request for changes
B．the improvement of the conditions there
C．a considerable increase in the school's budget
D．all of the above
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