--- What’s your answer, Alice?

--- Sorry, I ____ to you. Could you please repeat your question, Mrs Black?

A．am not listening

B．wasn’t listening

C．haven’t listened

D．won’t listen

企业从自身拥有的特长和优势出发，扬长避短，抓住某一领域进行高度专业化经营，体现的是( )市场竞争策略。

A．总成本领先

B．差别化

C．专一化

D．专门化