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.
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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.
单项选择题
A．By looking through the keyhole.B．By looking through the window.C．By taking pictures of the monkey.D．By hiding himself behind the box.
A．By looking through the keyhole.
B．By looking through the window.
C．By taking pictures of the monkey.
D．By hiding himself behind the box.
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