A. Preparing the Ground for a Pump System B. Pros and Cons of the Ground-Source Heat Pump C. The Ground-Source Heat Pump D. It Works for Me! 参考答案:D 答案解析:本题询问标题,实则询问全文的主旨,因此分析全文的结构有助于解题。文章第一段讲了“我”装置“the ground- source heat pump”的目的所在,接着介绍了装置的优点,最后一段表明了“我