单项选择题

A．He wants to have more sleep.
B．His wife doesn’’t sleep well.
C．Women need more sleep than men.
D．He doesn’’t need as much sleep as his wife.
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单项选择题
A．His research and teaching.B．His growth and his father.C．Intellectual development; nature or nurtureD．His clever and humorous character.
A．His research and teaching.
B．His growth and his father.
C．Intellectual development; nature or nurture
D．His clever and humorous character.
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.
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