Unit 1 Hero and courage Unit 2 Communication Unit 3 Stress Unit 4 Study abroad Unit 5 Consumption Unit 6 Aging Society Unit 7 Charity Unit 8 Leadership
Unit 1 Hero and courage Unit 2 Communication Unit 3 Stress Unit 4 Study abroad Unit 5 Consumption Unit 6 Aging Society Unit 7 Charity Unit 8 Leadership
以下为对购买帮助不大的评价