氨气分子空间构型是三角锥形，而甲烷是正四面体形，这是因为 （ ）
| A．两种分子的中心原子杂化轨道类型不同，NH3为sp2型杂化，而CH4是sp3型杂化。 |
| B．NH3分子中有一对未成键的孤对电子，它对成键电子的排斥作用较强。 |
| C．NH3分子中N原子形成三个杂化轨道，CH4分子中C原子形成4个杂化轨道。 |
| D．氨气分子是极性分子而甲烷是非极性分子。 |
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