题目内容：
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A．Nobody is poor in the US． B．The top 0．01 percent of households has seen its tax burden fall by a full 25 percentage points since 1980．
C．For upper class families they have risen 41 percent．
D．Now it is 9． 8 times．
E．As it does so, the possibility to cross that gap gets smaller and smaller．
F．All one has to do is to work hard and climb the ladder toward the top．
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答案解析：