对逆行性牙髓炎的患者进行探诊检查时，对诊断最有帮助的是（）

A.发现釉突

B.牙周袋溢脓

C.深牙周袋

D.有龈下石

E.探诊后出血

There are _____ in the reading room, but many of those books aren't _____.[ ]

A. enough books; enough easy

B. enough books; easy enough

C. books enough; easy enough

D. books enough; enough easy