单项选择题

The main idea of this passage is that ______.

A．although rats are affected by overcrowding, people are not
B．data from experiments indicate that overcrowding may be an important cause of social pathology
C．the social behavior of rats is seriously affected by overcrowding
D．Calhoun' s experiments have influenced many people
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单项选择题
According to the passage, which of the following is NOT true
A．Dominant males had adequate living space.
B．Dominant males were not as seriously affected by overcrowding as the other rats.
C．Dominant males attacked weaker rats.
D．The strongest males are always able to adapt to bad conditions.
单项选择题
Which of the following inferences CANNOT be made from the information in paragraph one
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.
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