牙震荡伤有轻微叩痛和松动，必要时可采用（）
A.降低咬合
B.正畸牵引术
C.药物脱敏
D.覆盖义齿修复
E.夹板固定
参考答案：A
补全对话，每空一词。
A: Good morning, everyone! I' m your English teacher. 1 name' s Tina Smith.
What's 2 name, boy?
B: My 3 David.
A: Nice to 4 you, David.
B: Nice to meet you, 5 .
A: What's the girl's name, please?
B: 6 name is Lily, she is 7 good friend.
A: 8 what's 9 name?
B: His name is Bill. He 10 my good friend, too.
1._____2._____3._____4._____5._____
6._____7._____8._____9._____10._____
领导者要集中精力抓大事。那么什么是大事？
