单项选择题

A．The man.
B．The woman.
C．Both the man and the woman.
D．Neither the man nor the woman.
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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．To avoid predators.B．To expose the eggs to stronger sunlight.C．To have a better view of predators.D．To save labor.
A．To avoid predators.
B．To expose the eggs to stronger sunlight.
C．To have a better view of predators.
D．To save labor.
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