Unit 3 A taste of English humourSTUDENTS BOOK 4ReadingTwo Pieces of CakeTom:Mom,can I have two pieces of cake,please?Mom:Certainly-take this piece and cut it two!Warming upBirthdayProfessor:When is your birthday?Kid:May 30.Professor:Which year?Kid:Every year.Are the jokes funny?Where does the humour come in the jokes?These funny jokes are humourous in the last line which called the“punchline”in English humour.Policeman:Why did you have to break into the same shop three times?Thief:Well,I stole a