年轻恒牙深龋意外穿髓首选的治疗方法是（）
A.直接盖髓术
B.活髓切断术
C.干髓术
D.根管壁感染的牙本质未完全去除
E.根管治疗术
参考答案：A
给下列图片选择恰当的句子。
A. ( ) B. ( ) C. ( )
D. ( ) E. ( )
1. Don't turn left here.
2. China sent this present to the UN in 1974. It's a train.
3. The snake thinks the flute is another snake. So it copies the other snake.
4. Look at this postcard. There are lots of bicycles in China. People ride them to work.
5. I have got some chopsticks, but they are difficult.
We found her _____ young _____ understand all about that．[ ]
A. too; to
B. too; not to
C. enough; to
D. so; to
