单项选择题

An opposable thumb is a thumb that can.

A．Pick up things.
B．Be place against the other fingers.
C．Press against the opposite thumb.
D．Press against anything.
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单项选择题
A monkey can pick up small objects by pushing its thumb against ______.
A．One of its fingers.
B．All its fingers.
C．Its paw.
D．The objects.
单项选择题
Hunters can catch monkeys by a coconut trap because monkeys ______.
A．are too greedy for the coconut they have found.
B．Have trouble finding out the rice.
C．Usually keep their paws closed to hold the rice.
D．Like to eat rice but not the coconut.
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