题目

Driving each other crazyThere’s a well-known joke: A woman is driving down a motorway and her husband phones her on her mobile. ‘Darling, be careful!’ he screams, ‘I’ve just heard there’s a car driving the wrong way on the motorway near where you are.’ ‘It’s not just one car,’ she says, ‘there are hundreds of them!’And here’s another one: a man is driving his daughter and they are stuck in traffic. The little girl says, ‘I have a question.’ ‘What is it?’ asks her father. ‘When you’re driving, are YOU ever the stupid idiot?’【1】 Is it because we recogn若函数y=（a-3）x|a|-2+2a+1是一次函数，则a= ．