单项选择题

A．For scientific study.
B．For field guides.
C．For entertainment.
D．For some film background sounds.
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单项选择题
A．Buy a new watch.B．Go to bed earlier.C．See a doctor.D．Change his job.
A．Buy a new watch.
B．Go to bed earlier.
C．See a doctor.
D．Change his job.
单项选择题
A．Experimental medicines.B．Special treatment centers.C．Flexible working schedule.D．Innovative physical exercises.
A．Experimental medicines.
B．Special treatment centers.
C．Flexible working schedule.
D．Innovative physical exercises.
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