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U1 Welcome to the unit
U1 Reading
U1 Grammar and usage
U1 Integrated skills
U1 Extended reading
U1 Project and Assessment
U1 单元综合复习
U2 Welcome to the unit
U2 Reading
U2 Grammar and usage
U2 Integrated skills
U2 Extended reading
U2 Project and Assessment
U2 单元综合复习
U3 Welcome to the unit
U3 Reading
U3 Grammar and usage
U3 Integrated skills
U3 Extended reading
U3 Project and Assessment
U3 单元综合复习
U4 Welcome to the unit
U4 Reading
U4 Grammar and usage
U4 Integrated skills
U4 Extended reading
U4 Project and Assessment
U4 单元综合复习