单项选择题

A．It would be better to choose more.
B．Three people have taken the course.
C．The man should attend tile class at three.
D．Four courses may be too many.
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D
单项选择题
A．In order to elevate their nests.B．In order to live more comfortably.C．In order to avoid predators.D．In order to make incubation easier.
A．In order to elevate their nests.
B．In order to live more comfortably.
C．In order to avoid predators.
D．In order to make incubation easier.
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