题目内容
We can make a round-the-world flight trip free of charge if we finish reading enough books.
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According to the talk, only real characters portrayed in books may become our friends.
Good books can provide us with a wide range of experiences.
Our human friends sometimes may make us bored, but the friends in books may also be hurt by us.
设A是三阶不可逆矩阵，α,β是线性无关的两个三维列向量，且满足Aα=β，Aβ=α，则 ()．
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