单项选择题

A．Fifty students.
B．Forty students.
C．Twenty-five students.
D．Fifteen students.
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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 pi
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 pi
单项选择题
A．A round piece of stone.B．A heavy log.C．Two slices of log connected at their centers by a strong stick.D．A piece of metal.
A．A round piece of stone.
B．A heavy log.
C．Two slices of log connected at their centers by a strong stick.
D．A piece of metal.
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