单项选择题


A．off
B．with
C．to
D．by
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单项选择题
A．heldB．takenC．gotD．developed
A．held
B．taken
C．got
D．developed
单项选择题
The passage mainly discusses how______.
A．birds prepare for breeding
B．bird feathers differ from species
C．birds shed and replace their feathers
D．birds are affected by seasonal changes
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