题目

Mrs. Thompson，a school teacher，told the children on the first day that she loved them all the same．But that was a lie．There in the front row was a little boy named Teddy Stoddard．He didn't get along well with the other children and he always needs a bath．She did not like him．     Then Mrs. Thompson got to know that Teddy was a very good boy before the death of his mother．Mrs. Thompson was ashamed of herself．She felt even worse when，like all her other students，Teddy bought her a present，too．It was his mother's perfume(香水)．     Teddy said，Mrs. Thomps如图，∠1＝∠2，∠3＝135°，则∠2＝________．