易燃介质是指与空气混合的爆炸下限小于()，或爆炸上限和下限之差值大于等于20%的气体，如一甲胺、乙烷、乙烯等。

A．3%

B．5%

C．10%

D．15%

--- Do you know the woman _____ glasses? ---Yes. And the girl _____ red is her daughter. 　　

A. with, with      

B. in, with         

C. with, in