—______ does your mother exercise?

—She hardly ever exercises. She doesn’t like sports.[ ]

A. When  

B. What sports  

C. What  

D. How often

关于可摘局部义齿基托伸展的范围，下列哪项是错误的().

A.义齿基托边缘应与天然牙轴面的倒凹区轻轻接触

B.上颌远中游离者，义齿基托应伸至翼颌切迹，远中颊角直覆盖上颌结节

C.下颌远中游离者，义齿基托应覆盖磨牙后垫前1／3～1／2

D.缺牙区若有骨质缺损，义齿基托伸展的范围应当扩大，若有骨突应适当缩小或作缓冲

E.缺牙多应适当大些，反之应小些