求新概念第二册48课课文复述,要简短点

A dentist had just pulled out one of a patience's teeth and had told him to rest for a while.Althouh he tried to say something,his mouth was full of cotton wool.The dentist asked him some questions,which he can only answer by nodding and making strange noises.After a while,he surprisingly found there was something wrong with his teeth!When the dentist at last removed the cotton wool from his mouth,he was able to tell the dentist that he had pulled out the wrong tooth!