What class are you in

unit 1 getting to know you
topic 3 what class are you in?
【教材分析】
本单元教学内容以问候和介绍为中心，从了解姓名到谈论来自哪里，再到谈论年龄、班级、电话号码等，用层层递进的方式逐步扩大和加深了解认识的不同方面，具有很强的逻辑性和整体性。
   topic 3 what class are you in? 继续介绍自己，了解他人的年龄以及所在年级、班级，谈论电话号码等；学习十一到二十以内的数字；初步学习可数名词的单复数及其用法。重要句型有：
  is this/that a/an ….?      yes, it is./no, it isn’t.
  are these/those orange?   yes, they are. /no, they aren’t.
  what’s this/that in english?   it’s a map/an eraser.
  what are those/these in english?  they are schoolbags.
  how old are you?    i’m twelve years old.
  what grade are you in?   i’m in grade seven.
  what class are you in?   she’s in class eleven, gra