单项选择题

It's strange that birds know when to ___________ and find their way back home.

A．immigrate
B．migrate
C．emigrate
D．immigrant
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单项选择题
She is so lucky that she has won ___________ to a first-rate American university.
A．accordance
B．allowance
C．permission
D．admission
单项选择题
We are under the ___________ that he always makes various contributions for nothing.
A．impression
B．compression
C．conclusion
D．confusion
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