单项选择题

We find that some birds ______twice a year between hot and cold countries.

A．transfer
B．migrate
C．commute
D．mobilize
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单项选择题
He’’s______ as a bellyacher -- he’’ s always complaining about something.
A．who is known
B．whom is known
C．what is known
D．which is known
单项选择题
A．the richB．richerC．richD．richness
A．the rich
B．richer
C．rich
D．richness
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