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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Because of a recent obstacle in production, sales have dropped and accordingly profits have ______.

A. declined
B. increased
C. broken
D. maintained

单项选择题

A full （）of all the reasons for and against closing the railway has begun

A. explosion
B. exploration
C. exploitation
D. explanation

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