单项选择题

A．Crude attempts were made to educate them.
B．They were used for medical experiments.
C．They were used as laborers.
D．They were locked away like criminals.
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Why do Americans try to conserve and manage time
单项选择题
A．Home accidents are as serious as road accidents.B．The careless use of electricity is one of the main causes of home accidents.C．modern electric equipment is too dangerous to be used with children and elderly people around.D．So far people pay little attention to home accidents.
A．Home accidents are as serious as road accidents.
B．The careless use of electricity is one of the main causes of home accidents.
C．modern electric equipment is too dangerous to be used with children and elderly people around.
D．So far people pay little attention to home accidents.
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