（单词翻译:单击）
Yang Zhu，a famous1 philosopher，had2 a younger3 brother named Yang Bu，who went out dressed in white one day．It began to rain so Yang Bu took4 off5 his white clothes and returned6 home dressed in black．His dog，failing to recognize7 him，rushed forward9 to bark10 at him Yang Bu was11 angry and wanted to beat12 the animal“Don't beat the dog，”said Yang Zhu，“you would13 have acted14 in the same way．If your dog had gone out a white dog and then came15 home black all over，wouldn't you have thought16 it very strange17？”
Exercises：
回答下列问题：
① Why did18 the dog rush8 forward to bark at him？
② What did Yang Zhu tell his brother？
