龋病一级预防不包括
A．口腔卫生宣教B．指定营养摄取计划C．使用含氟牙膏D．窝沟封闭E．及时治疗牙骨质龋
参考答案：E
用所给动词的适当形式填空。
1. What a pity (遗憾)! Some students just don’t know how __________(have )fun.
2. ---___________ your father ___________ (do) any housework at home?
--- No. My mother does it.
3. You should practise __________ (read) English every day if you want to learn it well.
4.Wendy always ____________ (dress ) up to celebrate Halloween.
5．Dad and Mum ____________ ( not be ) busy, so they can watch TV now.
某二叉树共有60个叶子结点与50个度为1的结点，则该二叉树中的总结点数为( )。
A．148
B．169
C．182
D．198
