Topic 3 How old are you?Section B学习目标：(1).学习不定冠词a, an的用法和识别单数物体（2）学习单词拼写的表达。学习重点： 掌握不定代词a和an的用法。学习难点及突破策略：学习难点：单数物体的表达。突破策略：运用具体实物进行强化练习。学习流程自主预习1. 默写数字0-20。2.根据下面表格的内容编一组对话。NameNancyFromCanadaAge14Phone number68003553Class11Grade7合作探究 1.this是指 that是指 2.找出有关单词拼写的句子：_这两种问法的答句的区别是 3.总结不定代词a和an的用法及区别_当堂评价.单项选择。(1）- Whats that in English? -Its _ car. Its _ orange car. A. a, an B. a, a C. an, an(2) This is _ English book. A. a B. an C. /(3) Is that your _?A. a bike B. bike C. an bike(4)- _ do you spell orange? -O-R-A-N-G-E, orange.A. How B. What C. Whats(5)- Whats this? -_ A Yes, its an egg. B. Its an orange. C. Its English car.拓展提升做游戏“蒙眼摸物”，完成2b。例如：S1: Whats this in English?S2: Is it a/an .?S1:Yes, it is. /No, it isnt. Its a/an S2: What is this in english?S3: Is it a/an ?S2: yes, it is./ No, it isnt. Its a/an S3:课后检测