题目

有下列各组物质： A．O2和O3                        B．C和C       C．CH3－CH2－CH2－CH3和CH3－－CH3 D．Br－Br和H－Br       E．甲烷和庚烷   F．CH3－CH3和C(CH3)4 G．CH3COOH与HCOOCH3            H．金刚石与石墨 回答下列问题： (1)________组互为同位素；          (2)________组属于同系物； (3)________组互为同分异构体；      (4)________组是同一物质．— It looks heavy. Can I give you a hand? — _____. A. No, thanks B. Yes, my pleasure C. No, never mind D. Yes, I do