单项选择题

A．Father and daughter.
B．Teacher and student.
C．Patient and doctor.
D．Athlete and coach.
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单项选择题
Why does the author say that nothing was wasted before the invention of fridges
A．People would not buy more food than was necessary.
B．Food was delivered to people two or three times a week.
C．Food was sold fresh and did not get rotten easily.
D．People had effective ways to preserve their food.
单项选择题
A．There were no motorists coming and going.B．The motorists drove too slowly.C．Some two students played a trick.D．The police placed a notice.
A．There were no motorists coming and going.
B．The motorists drove too slowly.
C．Some two students played a trick.
D．The police placed a notice.
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