单项选择题

A．Vacations.
B．Wages.
C．Overcrowded classrooms.
D．Paid sick leaves.
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填空题
According to the 1st paragraph, experts have interests in ____________.
单项选择题
A．At two o’clock.B．At three o’clock.C．At four o’clock.D．At five o’clock.
A．At two o’clock.
B．At three o’clock.
C．At four o’clock.
D．At five o’clock.
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