单项选择题

A．He / She can have it for a few hours.
B．He / She can have it for six hours.
C．He / She can have it for a single day.
D．He / She can have it for two days.
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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．Catching runaway criminals.B．Scratching the hidden bombs.C．Patrolling the dangerous town.D．Drug-sniffing and bomb-sniffing.
A．Catching runaway criminals.
B．Scratching the hidden bombs.
C．Patrolling the dangerous town.
D．Drug-sniffing and bomb-sniffing.
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