根据句意及汉语提示完成下列句子

1. —Why is he often late for school?    

   —Sorry, I don't know the ______（原因）．

2. Would you like some____（甜食）?

3. Do you like apples or____（草莓）?

4. There are many____（特色菜）in that restaurant.

5. Can I have a look at your____（菜单）?

关于联合卡环的叙述错误的是（）

A.由两个卡环通过共同的卡环体相连而成

B.卡环体位于相邻两基牙的外展隙并与伸向面的支托相连接

C.此类卡环的固位和支持作用良好

D.缺点是不能防止食物嵌塞

E.多用于单侧缺牙基牙牙冠短而稳固相邻两牙之间有间隙的基牙