Unit1 The Changing WorldTopic1【重点短语和句型】1. have a good summer holiday暑假过得愉快2. come back from从......回来3. have/has been to 去过4. have/has gone to去了5. not...any more 再也不...6. take photos 照相7. by the way 顺便问一下8. take part in 参加...