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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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
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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