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.
单项选择题
A．There’s much to do besides work and study.B．It’s convenient for people to go anywhere.C．The natural environment is beneficial to children.D．The countryside is a perfect place for weekends.
A．There’s much to do besides work and study.
B．It’s convenient for people to go anywhere.
C．The natural environment is beneficial to children.
D．The countryside is a perfect place for weekends.
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