单项选择题


A．such as
B．like
C．as
D．acting
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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
The main idea of this passage is that ______.
A．although rats are affected by overcrowding, people arc 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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