After the education reform(改革) in Jiangsu Province, the pupils have_______ time to relax and _______          

homework to do.

A．less; more

B．much; many

C．fewer; more

D．more; less

患者8岁，因上前牙外伤牙折3个月就诊，查体：左上颌中切牙冠1／2缺损，穿髓，右上颌中牙左侧切角缺损约1／4牙冠，断面尖锐，未见露髓孔，冷刺激稍敏感

右上颌第一切牙最佳处理方法（）

A.观察

B.脱敏治疗

C.树脂充填

D.全冠修复

E.银汞充填