单项选择题

A．On the ground.
B．In cold places.
C．On the highest branches of trees.
D．Inside three trunks.
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单项选择题
A．To a movie.B．On a two-week trip.C．To work.D．On a short visit to their neighbor.
A．To a movie.
B．On a two-week trip.
C．To work.
D．On a short visit to their neighbor.
单项选择题
A．Their flying ability improved greatly.B．They became warm-blooded.C．They began to lay eggs.D．They changed their migration patterns.
A．Their flying ability improved greatly.
B．They became warm-blooded.
C．They began to lay eggs.
D．They changed their migration patterns.
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