单项选择题

Sanford failed the midterm exam because ______.

A．the Professor had made a mistake
B．he had not written the essays according to the directions
C．he was too confident
D．he was always careless
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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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