题目

阅读下面短文，从短文后各题所给的A、B、C和D四个选项中，选出可以填入空白处的最佳选项。From my earliest childhood memories, my mother was my entire world. EachSunday morning, I would be1bysweet smells around the house. Watching my mother2food was attractive. She was totally3so I never asked questions, and her behaviorin-formed me that this wasn't a good time to4. My sisters and I would be seated at the5 and wait to get a taste of the cake. The family meals kept us6togetherand gave us an opportunity to connect with each other. No subject was7as we ate. My fa某三角形的第一条边长（2a-b）厘米，第二条边比第一条边长（a+b）厘米，第三条边是第一条边的2倍少b厘米，那么这个三角形的周长是________厘米．