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We know the one language (Beresheis 2:19) was Hebrew because Adam's very name derives from Hebrew (adamah); the 2 names he gave to Eve (Chava comes from chai/life) were Hebrew and only makes sense in Hebrew. He also called her isha (woman) because she was taken from the ish (man). (See Beresheis 2:23, 3:20 and Midrash Beresheis Rabbah 38).
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