第2题: [单项选择]The word "they" in paragraph 5 refers to ______ . A. practicality and rationality B. engineering and the liberal arts C. reality and noble ideals D. flexibility and a value system 参考答案:B 答案解析:结合上下文,很显然这个"they"是指代前一句话中的"engineering and the liberal arts”。