InPPPmethodclassesorsequences,theteacherpresentsthecontextandsituationforthelanguage,andbothexplainsanddemonstratesthemeaningandformofthenewlanguage．Thestudentsthenpracticemakingsentencesbeforegoingontoanotherstageinwhichtheytalkorwritemorefreely．PPPstandsforexcept__________．
A.Presentation
B.Procedures
C.Production
D.Practice
正确答案是B