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单项选择题
A．How birds learn to build nests.B．Why birds lay eggs.C．How bird’s nests have evolved.D．Why some bird’s nests are considered primitive.
A．How birds learn to build nests.
B．Why birds lay eggs.
C．How bird’s nests have evolved.
D．Why some bird’s nests are considered primitive.
单项选择题
A．The woman’s doctor.B．The woman’s husband.C．A shoe buyer.D．A shoe salesman.
A．The woman’s doctor.
B．The woman’s husband.
C．A shoe buyer.
D．A shoe salesman.
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