单项选择题


A．held
B．taken
C．got
D．developed
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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
单项选择题
The word random (Line 3, Para. 3) is closest in meaning to______.
A．unfortunate
B．unusual
C．unobservable
D．unpredictable
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