Tina has           three-month-old cat. She likes it very much.

A．/

B．a

C．an

D．the

某老年患者全口无牙颌，进行义齿修复时发现左侧颊系带附着于牙槽嵴顶，影响将来义齿固位。应该采用的治疗措施是

A．颊系带矫正术
B．牙槽突修整术
C．牙槽嵴加高术
D．不作处理，改变修复方法
E．不作处理，将来通过调磨义齿，进行缓冲