Over time,__________custom of kissing developed as_______way for adults to express their love for each other.

A．a; the

B．a; a

C．the; the

D．the; a

光驱的倍数越大，( )。

A．数据传输速度越快

B．纠错能力越强

C．所能读取光盘的容量越大

D．播放VCD效果越好