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.
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单项选择题
A．People without exposure to sunlight.B．Wealthy people in Europe centuries ago.C．Workers during the Industrial Revolution.D．Wealthy people during the Industrial Revolution.
A．People without exposure to sunlight.
B．Wealthy people in Europe centuries ago.
C．Workers during the Industrial Revolution.
D．Wealthy people during the Industrial Revolution.
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