单项选择题

He seemed reluctant to help us.

A. glad

B. tired
C. unwilling

D. pleased
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Penguins do not suffer from the cold in Antarctica because their feathers secrete a protective oil.
A．hide
B．warm
C．produce
D．absorb
单项选择题
Did anyone call when I was out
A. everyone
B. someone
C. nobody
D. anybody
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