将正方体骰子（相对面上的点数分别为1和6、2和5、3和4）放置于水平桌面上，如图①．在图②中，将骰子向右翻滚90°，然后在桌面上按逆时针方向旋转90°，则完成一次变换．若骰子的初始位置为图①的状态，那么按上述规则连续完成2013次变换后，骰子朝上一面的点数是（   ）

阅读短文，判断正误，用“正确”或“错误”表示。

Little Jack is playing with his friend near a bank. A man stops beside them. The door

opens and a man gets out. He is wearing a mask. There's a gun in his hand. Little

Jack's friend is frightened. But Jack is not. He runs to a policeman. "Please come

quickly," Jack says. "A robber（强盗） is in that bank." The policeman looks at the bank and

laughs. "Oh, good boy！" the policeman says. "But it's Ok. That man is not a robber.

He's an actor.（演员）"

公元前5世纪的雅典，产生了苏格拉底和克里斯提尼这样的伟大的大演说家，造成这种现象的主要原因是