https://online2.tingclass.net/lesson/shi0529/0009/9907/392.mp3
https://image.tingclass.net/statics/js/2012
讲解文本：
play favorites 偏心，偏爱
Teachers are not supposed to play favorites. That's unfair to other students.
老师不应该有偏心，这样对其他学生不公平。
It's ok to have a good friend in the office, but don't play favorites.
在办公室有一个朋友是好事，但也不要太偏心了。
疯狂练习吧!
