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下列各组物质一定互为同系物的是
①CH3CH2OH和CH3CH2CHO
②HCOOCH3和CH3COOCH2CH3
③CH3CH2O和HOCH2CH2OH
④CH4和C18H38
⑤C2H4和C6H12
⑥CH3OH和CH3OCH3
A、②③④⑤⑥ B、③⑤
B、②④ D、②④⑤