参考答案

正确答案：C
解析：[听力原文]
What is important for engineers in order to be able to talk and write clearly?
本题提到了几门学科，听录音时要注意这几个关键词。本文关键句为“A good command of language is important because engineers must be able to talk and write clearly.”可知工程师要表达流利清楚应该具备好的语言表达能力，故正确选项为C)。