单项选择题

The scientists have absolute freedom as to what research they think it best to ________.

A．engage
B．chase
C．seek
D．pursue
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单项选择题
I think you can take a(n) ________ language course to improve your English.
A．intermediate
B．middle
C．medium
D．mid
单项选择题
This is partly because of the importance of the interests ________ in immigration decisions: personal safety and liberty.
A．at odds
B．at stake
C．at liberty
D．at ease
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