8B Unit 1 短语和重点句型1. repair over/ more than ten bicycles 2. teach us a lot about the history of China 3. the changes in Beijing 4. during/in/over the past century5. learn more about Beijings past and present 6. hear about/ofhear from sb.= receive/ get ones letter=receive/get a letter from sb.7. living conditions 8. return sth. to sb. 9. make communication much easier10. go/travel/study abroad 11. at primary school 12. keep in touch with each other 13. communicat
