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A thousand-li journey is started by taking the first step. 千里之行，始于足下。

外研版英语必修一 1 2 3 4 5

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A thousand-li journey is started by taking the first step. 千里之行，始于足下。 外研版英语必修二 7 8 9 10 11

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A thousand-li journey is started by taking the first step. 千里之行，始于足下。

外研版英语必修三 14 15 16

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A thousand-li journey is started by taking the first step. 千里之行，始于足下。

外研版英语必修四 18 19 20 21