单项选择题

A．The eight-month-old baby.
B．Teenagers.
C．Mid-agers.
D．People in their 50s.
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单项选择题
A．In a geography class.B．In an astronomy class.C．In a geology class.D．In a biology class.
A．In a geography class.
B．In an astronomy class.
C．In a geology class.
D．In a biology class.
单项选择题
A．CaliforniaB．New JerseyC．Rhode IslandD．Pennsylvania
A．California
B．New Jersey
C．Rhode Island
D．Pennsylvania
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