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.
单项选择题
A．They can live in meadows.B．They can jump high to get food.C．They can live off many different kinds of hosts.D．They can survive without eating for many months.
A．They can live in meadows.
B．They can jump high to get food.
C．They can live off many different kinds of hosts.
D．They can survive without eating for many months.
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