慢性根尖囊肿最重要的诊断依据之一是
A．牙髓无活力
B．咬物异样感
C．根尖周亮区白线
D．根尖呈燕尾状吸收
E．牙龈瘘管挤出脓液
参考答案：C
小儿体重12kg，身长84cm，头围48cm，可能的年龄是（）。
A.12个月
B.14个月
C.18个月
D.22个月
E.24个月
What made the whole nation sad was that more than 100 miners were buried in the underground coal mine.
A．live
B．living
C．alive
D．lively
