单项选择题

In prehistoric times people seldom stayed anywhere for very long because their food supply usually ran out.

A．became depleted
B．was stolen
C．escaped
D．spoiled
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单项选择题
He spoke so quickly that it was difficult to take down what he was saying.
A．translate
B．record
C．follow
D．interpret
单项选择题
Penguins do not suffer from the cold in Antarctica because their feathers secrete protective oil.
A．hide
B．warm
C．produce
D．absorb
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