单项选择题

A．How birds’ nests have evolved.
B．Why some birds’ nests am considered primitive.
C．How birds learn to build nests.
D．Why birds lay eggs.
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单项选择题
A．By displaying their feelings and emotions.B．By exchanging their views on public affairs.C．By asking each other some personal questions.D．By greeting each other very politely.
A．By displaying their feelings and emotions.
B．By exchanging their views on public affairs.
C．By asking each other some personal questions.
D．By greeting each other very politely.
填空题
G
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