According to the talk, only real characters portrayed in books may become our friends.
查看答案
Good books can provide us with a wide range of experiences.
A. Right
B. Wrong
Our human friends sometimes may make us bored, but the friends in books may also be hurt by us.
A. Right
B. Wrong
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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