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
The success or failure of a coconut trap depends on ______.
A．What kind of rice is in the coconut.
B．How many holes are in the coconut shell.
C．How large the coconut is.
D．Whether the monkey will give up the rice.
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.
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