单项选择题

A．They are a type of insect.
B．They are a kind of fish.
C．They are a type of bird.
D．They are a type of pig.
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单项选择题
A．18 American undergraduates.B．18 American postgraduates.C．18 overseas undergraduates.D．18 overseas postgraduates.
A．18 American undergraduates.
B．18 American postgraduates.
C．18 overseas undergraduates.
D．18 overseas postgraduates.
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