单项选择题

A．When they wanted to kill an enemy.
B．When they wanted to identify a stranger.
C．When they wanted to tell the time of the day.
D．When they wanted to send a message to a person far away.
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单项选择题
A．It lives near the equator.B．It is able to fly.C．It lays its eggs underwater.D．It is the largest kind of penguin.
A．It lives near the equator.
B．It is able to fly.
C．It lays its eggs underwater.
D．It is the largest kind of penguin.
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