Lucy is always busy. She _____ only five hours every day. [ ]

A. is sleeping

B. will sleep

C. would sleep

D. sleeps

患牙有较大的穿髓孔并且根尖孔粗大，炎性牙髓组织呈息肉状经穿髓孔突出，探之不易出血。镜下见息肉由大量成纤维细胞和胶原纤维构成，伴散在的慢性炎细胞浸润，其表面被覆复层扁平上皮。该疾病是

A．牙髓钙化
B．慢性溃疡性牙髓炎
C．溃疡型慢性增生性牙髓炎
D．上皮型慢性增生性牙髓炎
E．牙髓纤维性变