“德意志民族曾经号称‘思想家和诗人的民族’，也涌现出了一流的科学家和艺术家。……但是，这个伟大的民族有曾在一个狂人的操纵下进行过最骇人听闻的大屠杀。”后者产生的历史根源是（    ）

阅读短文，下列问题

A

    It's two weeks before Christmas in England and Mrs. Smith is very busy. She buys a lot of Christmas cards to send to her friends and to her husband's friends. She puts them on the table in the room. Then, when her husband comes home from work, she says to him, “These are the Christmas cards for your friends. Could you please write the cards and I cook supper?”

    Mr. Smith doesn't say anything and walks into his study. After a while, he comes with a box full of Christmas cards. He puts them on the table and says, “They are from last year. I forgot(忘记) to send them.”

①____，切切故乡情。

②浮云终日行，____。

如图，△ABC的面积等于6，边AC=3，现将△ABC沿AB所在直线翻折，使点C落在直线AD上的C′处，点P在直线AD上，则线段BP的长不可能是（　　）