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单项选择题

What people firstly used flexible working hours

A．British.
B．Americans.
C．Germans.
D．Japanese.
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单项选择题What has the man not been able to do recently

A．Find his glasses.
B．Sit up straight.
C．Get enough rest.
D．Change his tires.

单项选择题What remedy did the man hear about as an aid to help people sleep

A．Experimental medicines.
B．Special treatment centers.
C．Innovative physical exercises.
D．Flexible work schedules.