原发性咬合创伤的形成是因为（）。
A.牙槽骨吸收
B.颌力过大
C.牙周支持力不足
D.牙龈炎症
E.牙周袋形成
参考答案：B
— I've studied growing plants as one of my interests. Could I make some suggestions?
— ______. [ ]
A. You will make it.
B. Go right ahead.
C. Don't mention it
D. Take it easy
