题目

能说明BF3分子的4个原子在同一平面的理由是（  ） A．B—F键的键角为120°                 B．B—F键是非极性键 C．3个B—F键的键能相等                D．3个B—F键的键长相等 答案：A---Honey, which movie should we watch tonight? ---I don’t mind which movie it is      there’s popcorn and soda. A．as if        B．now that           C．as long as        D．in order that