题目

It was a little before 8a.m. when Mathias Schergen, also known as “Mr.Spider, ” walked down the hall toward the office to sign in.It was the same ______ he had had as an art teacher of Jenner Academy of the Arts for nearly a quarter ______.Word had gotten out about his ______ and today was his final day.All day, teachers, parents and past students ______ by Jenner to say goodbye.So many stories of Mr.Spider ______ memories.Twenty-three years ago, when Mathias Schergen arrived at Jenner to ______, he wasn't Mr.Spider；he was just Matt.It wasn't ______ easy. For years, Schergen taught in on在三段论法中,M、P、S的包含关系可表示为(　　)                                                           图2-1-12