单项选择题

A．They have store detective.
B．They have big signs up, saying "Shoplifters will be prosecuted."
C．They use close- circuit television.
D．All of the above.
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单项选择题
A．The woman speaker is a doctor.B．The man speaker is called Silver.C．The man called the woman at lunchtime.D．The man’s wife wanted to have a check -up.
A．The woman speaker is a doctor.
B．The man speaker is called Silver.
C．The man called the woman at lunchtime.
D．The man’s wife wanted to have a check -up.
单项选择题
A．The researchers in Chicago.B．The doctors in Chicago.C．The medical students at the University of Chicago.D．The researchers in a dream lab at the University of Chicago.
A．The researchers in Chicago.
B．The doctors in Chicago.
C．The medical students at the University of Chicago.
D．The researchers in a dream lab at the University of Chicago.
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