单项选择题

A．He is a college professor.
B．He is in the a computer company.
C．He is in the advertising business.
D．He is a computer specialist.
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单项选择题
A．7 and half hours.B．10hour.C．8 and half hours.D．8 hours.
A．7 and half hours.
B．10hour.
C．8 and half hours.
D．8 hours.
单项选择题
A．By predictions.B．By recording.C．Through observation.D．Through interviewing.
A．By predictions.
B．By recording.
C．Through observation.
D．Through interviewing.
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