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opportunity
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单项选择题
A．Husband and wife.B．Teacher and student.C．Policeman and driver.D．Mother and son.
A．Husband and wife.
B．Teacher and student.
C．Policeman and driver.
D．Mother and son.
填空题
______ ( 重大事故接连出现，给人民生命财产造成重损失) have taught us a sobering lesson.
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