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.
单项选择题
A．It’s too broad to cope with.B．It’s a hit outdated.C．It’s controversial.D．It’s of little practical value.
A．It’s too broad to cope with.
B．It’s a hit outdated.
C．It’s controversial.
D．It’s of little practical value.
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