单项选择题

A．A flight to Los Angeles.
B．A book written by a doctor.
C．A disease on the comeback and its reasons.
D．Man’s effort to control disease.
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单项选择题
A．From eight o’clock in the morning until noon.B．From noon until six o’clock in the evening.C．From eight o’clock in the morning until nine o’clock at night.D．Twenty-four hours a day.
A．From eight o’clock in the morning until noon.
B．From noon until six o’clock in the evening.
C．From eight o’clock in the morning until nine o’clock at night.
D．Twenty-four hours a day.
填空题
When people run into problems and their complaints to the customer services can not work, they can turn to ______.
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