learning aim ：learn and grasp the usages of some important new words and expressions. learning important point： use some useful words and expressions correctly. learning difficult point： make sentences after the useful sentence patterns. 使用说明及学法指导： 1. discussing, summarizing and practicing 2 .cooperative learning 使用说明及学法指导：1. 通过阅读课本p25-27，完成预习案。2. 完成时间：30分钟。预习案 previewing case task 1自学《同步测练》并完成即讲即练。 task 2 重点短语及单词翻译 1.现象n. ____________ 2.资料; 数据n. ________ 3.趋势; 倾向; 走向n. ________
