Unit 4 Amazing ScienceTopic 2 When was it invented? 【最新】九年级英语上册 Unit4 Topic2 Section D 仁爱版 课件 Haveyouevergotlostsomewhere?Whatmethod didyouusetofindyourdirection? （影片） 【最新】九年级英语上册 Unit4 Topic2 Section D 仁爱版 课件 Read and discuss the following questions. 1. What would you do if you lose your way in a forest? 2. How did the early explorers know where they were? 3. What is GPS? Is it useful to us? 4. What do you think GPS will be used for in the future? 【最新】九年级英语上册 Unit4 Topic2 Section D 仁爱版 课件 What
