第17题: [单项选择]The word "disciplines" in the first sentence of Paragraph 1 means ________. A. rules B. systems C. practice D. subjects of study 参考答案:D 答案解析:[解析] 词汇题。从该词所在的第一段第一句可知,此处“support disciplines”是工人所从事职业的性质,“disciplines”原义为“纪律,教训”,并有“学科”的含义,结合四个选项内