x1u2 reading and thinking 音频: 进度条 00:00 03:57 撤退15秒 倍速 快进15秒
x1u2 using language-part 3 音频: 进度条 00:00 02:34 撤退15秒 倍速 快进15秒
X1U2 Using Language-Welcome or reject future changes 音频: 进度条 00:00 03:14
X1U2 Words and Expression 音频: 进度条 00:00 05:45
X1U2 Workbook-Listening and Speaking-part 2 音频: 进度条 00:00 02:38
X1U2 Workbook-Listening and Speaking-part 3 音频: 进度条 00:00 02:26
X1U2 Workbook-Listening and Speaking-part 4 音频: 进度条 00:00 02:19
X1U2 Workbook-Reading and Writing 音频: 进度条 00:00 04:30
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