牙拔除后3~4天,出现拔牙创剧烈疼痛,最可能是
A.干槽症
B.牙槽突骨折
C.牙龈损伤
D.牙槽窝内有异物
E.过高骨嵴和骨尖
参考答案:A
Kate can play _________ piano but she can’t play ________ football.
A. the , the B. \ , the C. the , \
怎样看待“B超”、“CT”等外语缩写词?