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 politely refrained himself ______ saying what he thought of her hat.
A．against
B．by
C．from
D．out
单项选择题
When confronted with such questions, my mind goes ______, and I can hardly remember my own date of birth.
A．dim
B．blank
C．faint
D．vain
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