单项选择题

A．Working on DNA.
B．Wearing a necklace.
C．Taking blood samples.
D．Making identification tags.
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单项选择题
A．By bus.B．By car.C．By plane.D．By train.
A．By bus.
B．By car.
C．By plane.
D．By train.
单项选择题
A．Different family backgrounds.B．The generation gap.C．Traveling and studying overseas.D．Different interests and hobbies.
A．Different family backgrounds.
B．The generation gap.
C．Traveling and studying overseas.
D．Different interests and hobbies.
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