单项选择题


A．such as
B．like
C．as
D．acting
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单项选择题
Calhoun stabilized the rat population ______.
A．when it was double the number that could live in the enclosure without stress
B．by removing young rats
C．so that there was a constant number of adult rats in the enclosure
D．all of the above are correct
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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