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．They strongly believe in family rules.B．They are very likely to succeed in life.C．They tend to take responsibility for themselves.D．They are in the habit of obeying their parents.
A．They strongly believe in family rules.
B．They are very likely to succeed in life.
C．They tend to take responsibility for themselves.
D．They are in the habit of obeying their parents.
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