单选题 The word "they" in "…together they threaten to confuse." (Line 3, Par

A、 5) refers toA. engineering and the liberal-artsB. reality and noble idealsC. flexibility and a value systemD. practicality and rationality

【正确答案】 A

【答案解析】判断指代关系。文章第五段第二行、第三行的“they”都是指代前文的“engineering and the liberal-arts。”