25．---I’d like to invite you to dinner this Sunday, Mr．Smith．

---_____．

A．Oh, no．Let’s not

B．I’m very sorry, but I have other plans

C．I’d rather stay at home

D．Oh, no．That’ll be too much trouble

下列表达式错误的是 [ ]

A．甲烷的电子式：

B．氮原子的L层电子轨道表示式：

C．硫离子的核外电子排布式：1s²2s²2p⁶3s²3p⁴

D．碳-12原子：¹²₆C