若D7舌侧卡环磨光时变形，主要是由于什么磨具使用不当造成的（）
A.布轮
B.绒锥
C.砂轮
D.黑毛刷
E.白毛刷
参考答案：A
More and more people have got to know the importance of the English study. ______, about six people in ten in this city are able to speak a little English.
A．Believe it or not
B．In other words
C．Besides
D．However
下列哪项不是急性根尖周炎浆液期的临床症状（）
A.患牙浮出感
B.咬紧牙时痛缓解
C.自发痛
D.叩诊痛
E.温度测验敏感
