Yesterday,when I visited my cousin,I find he went to the bathroom very often.He didn't look like alright."What is wrong about you?"I asked him."I think I had too many milk this morning,"he said.I asked him how.He said,"My mother went to a supermaket yesterday afternoon.When she saw some milk on sale,she bought three big bottle.We had to finish all milk this morning because it was no longer fresh."I knew what she meant.My aunt wanted to save some money through buy the cheap milk.I real don't think she should have done that.