单项选择题

A．To chat with Simon socially.
B．To get help in the course.
C．To hand in their assignments.
D．To practise giving interviews.
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单项选择题
A．Two.B．Three.C．Four.D．Fiv
A．Two.
B．Three.
C．Four.
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单项选择题
A．5,400,000 years.B．65,000,000 years.C．8,400,000 years.D．75,000,000 years.
A．5,400,000 years.
B．65,000,000 years.
C．8,400,000 years.
D．75,000,000 years.
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