下列物质不属于醛类的物质是（　　）

    Hello! My name is John. I'm a boy. I'm eleven years old. I have three friends. They are May, Peter and Xiao Mao. May is a girl. She is twelve years old. She is from Canada. Peter is a boy. He is thirteen years old. He is from China. Xiao Mao is a boy. He is two years old, He likes eating meat. Haha, he is a dog!

根据上面短文的意思判断下面的句子是否正确。

著名文化学者余秋雨说，黄河流域80万平方公里，长江流域180万平方公里，而当时世界上所有文明流域加起来的面积也只是中国的1/15。所以，气魄、宏伟的统一文明是中国文化的一大特点。由此可见（    ）

①中华文化就是中华文明

②中华文化博大精深

③中华文化一直走在世界前列

④我国各族人民对中华文化有认同感和归宿感