如图，将一边长为a的正方形（最中间的小正方形）与四块边长为b的正方形（其中b＞a）拼接在一起，则四边形ABCD的面积为（　　）

    I learned all about taking responsibility from my mother's tough love. My mom had a wonderful way of helping you1up and realize that your life is going to be what you make it.

    She had this circular way of2you took responsibility for your decisions and the person you would3She would say, “It's your4”5,“What you want and what you get are sometimes two6different things.” And then, “No one ever said life was fair.” And she would7these comments together in such a way that you could never8an argument, and yet, the9was that you realized your life is going to be what you make it.

    So I might go to my mom and say, “I'd like to10football”. And she would say, “Well, it's your life. If you want to go out there and get11and hurt and break your knees and limp around the rest of your life, that's fine.” That is12I would say, “Well, you know, that won't13I'm really fast.” And she would reply, “Well, we don't really have the money.” And then I would14, “Yes but that's not fair.” And she would reply, “Well, life isn't15” Then I would say, “But I've been eager to." And she would reply, “Yes, but what you want and what you get are usually two entirely different things.”

    It was the combination of these16that allowed my mother to lead me down the right path under her17but let me feel as if I was making the decisions18my own. The sum total of that19was, in the end, you're20for the life you lead. That's the best advice I've ever gotten.

阅读下文，回答问题

外婆和鞋

席慕容

    ①我有一双塑胶的拖鞋，是在出国前两年买的，出国后又穿了五年。它的形状很普通，就像你在台北街头随处可见的最平常的样式：平底，浅蓝色，前端镂空成六个圆带子，中间用一个结把它们连起来。买的时候是喜欢它的颜色，穿了五六年后，已经由浅蓝色变成浅灰，鞋底也磨得一边高一边低了。

    ②你知道我为什么舍不得丢掉它吗？

    ③这是个让生命在刹那间变得非常温柔的回忆。大学快毕业时，家住在北投山上，没有课的早上，我常常会带着两只小狗满山乱跑。有太阳的日子，大屯山腰上的美丽简直无法形容，最让我快乐的是在行走中猛然回过头，然后再仔细辨认，山坡下面，哪一幢是我的家，走着走着，我的新拖鞋就不像样了。不过，我没时间管它，直到有一天，傍晚，放学回家，隔着矮矮的石墙，看见我的拖鞋被整整齐齐地摆在花园里的水泥小路上。带着刚和同学分手后的那一点嚣张，我就在矮墙外大声地叫起来：

    ④“何方人士，敢动本人的拖鞋？”花园那边没有动静。再往客厅的方向看过去，外婆正坐在纱门后面，一面摇扇子，一面看着我笑呢。

    ⑤“今天下午，我用你们浇花的水管给你把拖鞋洗了，刚放在太阳地里晒晒就干了。多方便！多大的姑娘啦！穿这么脏的鞋给人笑话。”

    ⑥以后，每次上山时，外婆总会替我把拖鞋洗干净，晒好，有时甚至给我放到床前。然后在傍晚时分，她就会安详地坐在客厅里，一面摇扇子，一面等着我们回来。我常常会在穿上拖鞋时，觉得有一股暖和与舒适的感觉，不知道是院里下午的太阳呢，还是外婆手上的余温？

    ⑦就是因为舍不得这一点余温，外婆去世的消息传来以后，所有能够让我纪念她老人家的东西：比如出国前夕给我的戒指，给我买料子赶做的小棉袄，都在泪眼盈盈中好好地收起来了。这双拖鞋，也就一直留在身边，舍不得丢。每次接触到它灰旧的表面时，便仿佛也接触到曾洗过它的外婆的温暖而多皱的手，便会想起在夕阳下的园中小径，和外婆在客厅纱门后面的笑容。那么遥远，那么温柔，而又那么肯定地一去不返。