单项选择题

We can conclude from the first two paragraphs that whether a male practices monogamy of polygamy depends on ______.

A．the amount of nurturing the young
B．the sex of offspring
C．the attractiveness of his female partner
D．the time of conception
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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
单项选择题
According to the passage, male marmoset and tamarin monkeys ______
A．can't defend more than one female
B．practice monogamy
C．get more offspring
D．invest heavily in their partners and the young
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