单选题:对下列常见现象的解释,正确的一项是(  )。

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题目内容:
对下列常见现象的解释,正确的一项是(  )。 A.物体热胀冷缩,是因为分子的大小随温度的变化而改变
B.破镜难圆,是因为分子间有排斥力
C.花香四溢,是因为分子在不停地运动
D.水往低处流,是因为分子在不停地运动

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