54．B　推理判断题。由第二段倒数第二句中的“…46% the middle class”一句可知在美国，有差不多一半的人属于中产阶级，选B。

　　55．A　细节理解题。由第三段中的“Power and class do not always go hand in hand, however.”可知，权力和阶级并不总是保持一致。选A。

　　56．A　篇章结构题。本文第一段是主题段，“Class, power and status are important in deciding people's rank in society.”是本文的主题句，后三段分别从这三个方面来论述，故本篇文章是总分的结构。选A。

　　C7 [2017·四川卷] ----D

　　Home to me means a sense of familiarity and nostalgia(怀旧)．It's fun to come home. It looks the same. It smells the same. You'll realize what's changed is you. Home is where we can remember pain，love，and some other experiences：We parted here; My parents met here; I won three championships here.

　　If I close my eyes, I can still have a clear picture in mind of my first home. I walk in the door and see a brown sofa surrounding a low glass－top wooden table. To the right of the living room is my first bedroom. It's empty，but it's where my earliest memories are.

　　There is the dining room table where I celebrated birthdays, and where I cried on Halloween—when I didn't want to wear the skirt my mother made for me.I always liked standing on that table because it made me feel tall and strong. If I sit at this table, I can see my favorite room in the house，my parents' room. It is simple: a brown wooden dresser lines the right side of the wall next to a television and a couple of photos of my grandparents on each side. Their bed is my safe zone. I can jump on it anytime—waking up my parents if I am scared or if I have an important announcement that cannot wait until the morning.

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