单项选择题


A．for
B．on
C．up to
D．away with
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单项选择题
A．such asB．likeC．asD．acting
A．such as
B．like
C．as
D．acting
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.
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