Wemaynotbeawareofitb的精选

问题详情：Wemaynotbeawareofit,butordinaryfamilyhomesintheU.S.andtherestoftheworldarenotenergy-efficient.Mostoftheirenergygoestoheatingandcooling,andalotofitiswasted,aswarmairandcoolairescapethroughfirep...