下列结论中正确的个数是（  ）
（1）在回归分析中，可用指数系数$R^2$的值判断模型的拟合效果，$R^2$越大，模型的拟合效果越好；
（2）在回归分析中，可用残差平方和判断模型的拟合效果，残差平方和越大，模型的拟合效果越好；
（3）在回归分析中，可用相关系数r的值判断模型的拟合效果，r越小，模型的拟合效果越好；
（4）在回归分析中，可用残差图判断模型的拟合效果，残差点比较均匀地落在水平的带状区域中，说明这样的模型比较合适．带状区域的宽度越窄，说明模型的拟合精度越高．

    Ben and Jim are twin brothers. They are nine. They are pupils. They study in Yuxin Primary School. They are in the same class. Everyday they go to school and come back together.

    Their teacher, Mrs. Green, says to the pupils. Please write a composition (作文) 'My Mother'.

    Jim is a good boy. He writes the composition at home. But Ben plays football with his friends. The next day Mrs Green says to the class, “I read your compositions today. But two of yours are just the same.” Ben stands up and says, “Jim and I are twins. We have the same mother.”

你在一张白纸上用红色的笔写下“物理”两个字，再透过蓝色的玻璃看这张纸（   ）