3 Listen and number. 听一听，写序号。

4－3－1－2

4 Read and match. 读一读，连一连。

1 What are they doing? A. Yes, I am.
2 Are you picking grapes? B. They're digging.
3 Are your seeds growing? C. Yes, they are.

4 1 B 2 A 3 C

【分析】先明确每个问句的类型和主语：1题是What引导的特殊疑问句，询问复数主语“they”的动作，答语需说明动作；2题是Are you开头的一般疑问句，主语是you，答语主语用I；3题是Are your seeds开头的一般疑问句，主语是复数物，答语用they指代，据此匹配对应选项。
【解析】1. 问句1“What are they doing?”询问他们正在做的事，答语需回答动作，选项B“They're digging.”匹配，故1连B；2. 问句2“Are you picking grapes?”主语是you，一般疑问句答语用I，选项A“Yes, I am.”匹配，故2连A；3. 问句3“Are your seeds growing?”主语是复数名词seeds，答语用they指代，选项C“Yes, they are.”匹配，故3连C。
【答案】1 B 2 A 3 C
【知识点】英语特殊疑问句、英语一般疑问句、日常交际用语
【点评】本题考查日常英语问答的匹配，属于基础交际题型，需掌握不同问句对应的答语规则，难度不大。
【难度系数】0.3