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单项选择题

A．Mary is a housewife.
B．Mary and her family usually visit her parents in summer.
C．Mary doesn’ t often visit her parents.
D．Mary’ s mother was out shopping when Mary called.
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单项选择题A．$ 4.00.B．$ 5.00.C．$ 1.00.D．$ 9.00.

A．$ 4.00.
B．$ 5.00.
C．$ 1.00.
D．$ 9.00.

单项选择题A．They reduce a person’ s appetite.B．They make a person less persistent in face of trouble.C．They make a person’ s nervous system weak.D．They make a person more vulnerable to disease.

A．They reduce a person’ s appetite.
B．They make a person less persistent in face of trouble.
C．They make a person’ s nervous system weak.
D．They make a person more vulnerable to disease.