把蚕豆叶表皮浸泡在一定浓度的尿素溶液中，表皮细胞发生了质壁分离。一段时间后，表皮细胞自动出现质壁分离复原，其原因是A.细胞壁被破坏B.原生质层被破坏C.尿素溶液浓度低于细胞液浓度D.尿素分子进入细胞
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D