单项选择题


A．titles
B．status
C．assignments
D．positions
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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
A．conservativeB．usualC．traditionalD．unhappy
A．conservative
B．usual
C．traditional
D．unhappy
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