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【单选题】
下列说法正确的是 [     ]
A.
两种物质的组成元素相同，各元素的质量分数也相同，则两者一定为同分异构体
B.
分子式为C n H 2n 的化合物，可能使酸性KMnO 4 溶液褪色，也可能不褪色
C.
通式相同，组成上相差一个或n个“CH 2 ”原子团的化合物，一定互为同系物
D.
凡含有苯环的物质都是芳香烃
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