引起水平型骨吸收的是（）
A．慢性牙周炎
B．食物嵌塞
C．创伤
D．更年期
E．反
参考答案：A
--- Why were you so late for work today？
--- ________ to the office was very slow this morning because of the traffic.
A． Driving
B．I drove
C．To drive
D．That I drove
30. He insisted on going abroad to have further study ____ his parents objection.
A．by means of
B．in favour of
C．regardless of
D．on purpose of
创伤
创伤