A corps of so-called barefoot doctors were trained in
hygiene
, preventive medicine, acupuncture, and routine treatment of common diseases.
【正确答案】
B
【答案解析】解析：hygiene“卫生，保健”。nutrition“营养”；sanitation“卫生”；nursery“婴儿室”；welfare“健康，福利”。根据句意，赤脚医生肯定要经常接受卫生、预防、针灸等的培训，故选B。