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incidents
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单项选择题
A．Working on DNA.B．Wearing a necklace.C．Taking blood samples.D．Making identification tags.
A．Working on DNA.
B．Wearing a necklace.
C．Taking blood samples.
D．Making identification tags.
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.
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