单项选择题

The passage mainly discusses_______

A．certain evolutionary advantages of New World monkeys
B．feeding habits of the spider monkey
C．the development of arms and shoulders in New World monkeys
D．some anatomical adaptations of Asiatic gibbons

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单项选择题

It can be inferred from the passage that the Asiatic gibbons and certain New World monkeys are similar in what respect

A．The length of their tails.
B．Their mating habits.
C．The ability to grip with their feet.
D．Their upper body structure.

单项选择题

In the second sentence, the word their refers to_______

A．New World monkeys
B．Old World monkeys
C．spider monkeys
D．Asiatic gibbons