题目

△ABC中，D、E分别为AB、AC的中点，若DE＝4，AD＝3，AE＝2，则△ABC的周长为______． 答案：【答案】18【解析】∵点D，E分别是△ABC的边AB，AC的中点，∴DE是△ABC的中位线，∴AB=2AD=2×3=6，AC=2AE＝2×2=4，BC=2DE=2×4=8，∴AB+AC+BC=18，即△ABC的周长为18，故答案为：18.  Although his excuse was as good as _      _ other, I don’t believe that was a fact．       A． one               B． each               C． every             D． any