P14 Unit 2 开篇页视频
P15 Unit 2 开篇页 Listen and chant
P15 Unti 2 开篇页 Listen and sing
P16 Unit 2 A Let's talk
P16 Unit 2 A Listen, sing and play
P17 Unit 2 A Let's learn
P17 Unit 2 A Listen and chant
P18 U2 A Listen,repeat chant 1
P18 U2 A Listen,repeat chant 2
P18 Unit 2 A Letters and sounds
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