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【单选题】
在显微镜下观察一个成熟的植物细胞，你会发现细胞核不在细胞的中央，而是位于细胞的一侧，造成这种现象的原因是 [ ]A.
细胞质的流动
B.
细胞的分裂
C.
细胞核的活动
D.
液泡的膨胀
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