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

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