单项选择题

The word "intervention" (Line 3, Para. 1) can best be replaced by ______.

A．need
B．device
C．influence
D．reproduction
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单项选择题
We can infer that the chance for female marmoset and tamarin monkeys to have twin births depends on ______.
A．the number of male they have access to
B．the workload they have in bringing up the young
C．the time when they come into estrus
D．the size of the males' bodies
单项选择题
The passage mainly discusses _______.
A．division of labor between male and female mammals
B．how male are involved in the rearing process
C．how females choose their partners
D．factors affecting monogamy and polygamy
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