Wemaynotbeawareofitb的精選

問題詳情：Wemaynotbeawareofit,butordinaryfamilyhomesintheU.S.andtherestoftheworldarenotenergy-efficient.Mostoftheirenergygoestoheatingandcooling,andalotofitiswasted,aswarmairandcoolairescapethroughfirep...