1If you really want to lose weight,you might avoid staying with friends./ B' U$ p! G8 p3 F6 N+ f3 z5 L* P
2If your friends are fatter than yourself,the student might be fat.: s" h8 x; u( S& R& c) i
3the study aim at why the fat and the related behavior get together in society.
' h n) b- g: `, `4the index of students’ weight is caculated by the height and the weight. |