单项选择题

A．Seven hours.
B．Eight hours.
C．Nine hours.
D．Six hours.
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单项选择题
A．A student and a professor,B．A physicist and a biologist.C．Two students.D．Two professors.
A．A student and a professor,
B．A physicist and a biologist.
C．Two students.
D．Two professors.
单项选择题
A．$200B．$400C．$3000D．$100
A．$200
B．$400
C．$3000
D．$100
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