【英语2级听力】接替的老师-Substitute Teacher（在线收听）

Ms. Smith is a great teacher. She makes math look easy. She also teaches her students how to be great people. Ms. Smith feels sick one day. Another teacher substitutes. Mr. Johnson teaches the class instead. Mr. Johnson is a bad teacher. He makes math confusing. He also yells at the students a lot. The students want Ms. Smith back.