单项选择题

A．Experimental medicines.
B．Special treatment centers.
C．Flexible working schedule.
D．Innovative physical exercises.
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单项选择题
A．She went shopping.B．She did some sewing.C．She repaired her car.D．She bought some tobacco.
A．She went shopping.
B．She did some sewing.
C．She repaired her car.
D．She bought some tobacco.
单项选择题
A．For scientific study.B．For field guides.C．For entertainment.D．For some film background sounds.
A．For scientific study.
B．For field guides.
C．For entertainment.
D．For some film background sounds.
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