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 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.

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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

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.