完形填空。
Dear friend,
     I am 1 American school girl. My name is Alice Green. I am twelve. I 2 two brothers. My brothers and I 3 all at school. We go to school 4 Monday 5 Friday. We 6 have classes on 7and Sunday. We don't go to school on weekends. My father and my mother are teachers. They say China is great. I like 8, and I can sing a lot of songs. My brother and I like baseball and basketball. 9do you like? Let's10friends. Please write soon.
Yours,
Alice Green

北京市某中学曾有一个优秀的班集体，被人们称为“保尔班”。这个班的班长，在刚入学时是一个只顾埋头读书的学生。他对集体、对同学都很淡漠，觉得学好功课才是最实惠的。后来在班主任老师和同学们的帮助下，他从“我”字的小天地里走出来，变得热爱集体、关心同学，学习也更加进步，年年被评为“三好学生”。“保尔班”班长的转变说明（　　）

①.班集体是我们成长的乐园

②.集体的力量是巨大的

③.良好的班集体有利于我们培养良好的品德

④.良好的班集体有利于我们的身心健康