根据以下叙述，回答1－3小题：下图是4个碳原子相互结合的8种有机物（氢原子没有画出）
有机物E的名称是（ ）
| A．丁烷 | B．2－甲基丙烷 | C．1－甲基丙烷 | D．甲烷 |
每个碳原子都跟两个氢原子通过共价键结合的有机物是（ ）
| A．B | B．F | C．G | D．H |
有机物B、C、D互为（ ）
A．同位素 B．同系物 C．同分异构体 D．同素异形体
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