阅读以下说明和流程图，回答问题1至问题3，将解答填入答题纸的对应栏内。
【说明】
信息处理过程中经常需要将图片或汉字点阵做旋转处理。一个矩阵以顺时针方向旋转90°后可以形成另一个矩阵，如下图所示：
流程图1-1描述了对n*n矩阵的某种处理。流程图1－2是将矩阵A顺时针旋转90°形成矩阵B的具体算法。
【问题1】（3分）请写出以下3*3单位矩阵沿顺时针方向旋转90°后所形成的矩阵。
【问题2】（3分）如果以下3*3矩阵沿顺时针方向旋转90°后所形成的矩阵就是原来的矩阵：
其中，位于*处的元素需要考生填写，请完整地写出该矩阵。
【问题3】（9分）在上述流程图1－1和1－2的算法中，
（1）矩阵A第i行第j列的元素A（i，j）被复制到矩阵B中的哪个位置？
（2）A（i，j）后来又被复制到矩阵C中的哪个位置？
（3）填补流程图1－2中的空缺。
正确答案及解析
正确答案
解析
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