Unit 6 When was it invented? 第二课时Section A（3a-4c）学案（含答案）

九全英语Unit 6 When was it invented？ 第2课时 Section A （3a-4c）课时练（含解析）

九上英语Unit 6 When was it invented？ Section B 课时练习（含答案）

Unit 9 When was it invented? Section B 1a -2c

Unit6 When was it invented全单元导学案(有答案)

Unit 6 When was it invented? 单元导学案(4课时)

人教版英语九年级全册 Unit 6 When was it invented？ Section B 2a-2e导学案（无答案）