单项选择题

A．They began to lay eggs.
B．They changed their migration patterns.
C．Their flying ability improved greatly.
D．They become warm-blooded.
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单项选择题
A．Yell loudly.B．Argue fiercely.C．Express his opinion frankly.D．Refrain from showing his feelings.
A．Yell loudly.
B．Argue fiercely.
C．Express his opinion frankly.
D．Refrain from showing his feelings.
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