单项选择题


A．should
B．ought
C．like
D．have to
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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
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
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