修订版前言 初版前言 CENERAL INTRODUCTION TO CECL(for the teacher) UNIT 1:GETTING TO PLACES UNIT 2:DEALING WITH PEOPLE UNIT 3:HOUSE AND HOME UNIT 4:EDUCATION UNIT 5:REVIEW MID-TERM TEST UNIT 6:ANIMALS AND PLANTS UNIT 7:CELEBRATIONS UNIT 8:FOOD AND DRINK UNIT 9:HEALTH AND MEDICINE UNIT 10:REVIEW FINAL TEST