下列哪项不属于行为问题

A．屏气发作

B．儿童擦腿综合征

C．遗尿症

D．注意力缺乏、多动障碍

E．学习障碍

Sometimes walking is even_________than driving during the busy traffic time.    [ ]

A. fast                      

B. faster    

C. slow                      

D. slower