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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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
单项选择题
According to the passage, which of the following statements is NOT true
A．Although birds preen, the feather wears out.
B．Two processes are involved in molting.
C．When most feathers have been replaced, then the molt is completed.
D．A bird seems unwell when molting.
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