单项选择题

A corps of so-called barefoot doctors are trained in hygiene, preventive medicine, acupuncture, and routine treatment of common diseases.()

A．nutrition
B．sanitation
C．nursery
D．welfare

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单项选择题
His inability to learn foreign languages was a(n) obstacle to his career.()

A．barrier
B．excess
C．carrier
D．impulse
单项选择题
In the deserted factory several huge machines were left to rust and decay.()

A．inaugurate
B．disintegrate
C．accelerate
D．disseminate
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