单项选择题

A．Rat flea.
B．Cat flea.
C．Dog flea.
D．Rabbit flea.
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单项选择题
A．A disease.B．A cause of fatal plague.C．A substance in a flea’s legs.D．The substance that a flea lives on.
A．A disease.
B．A cause of fatal plague.
C．A substance in a flea’s legs.
D．The substance that a flea lives on.
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