使用斧形切龈刀作牙龈切除术时，刀刃应距所测标记线即牙周袋底的根方距离为
A．1～2mm
B．2～3mm
C．3～4mm
D．2mm
E．3mm
参考答案：A
句型转换。
1. She does her homework at home. (对划线部分提问)
_____ _____ she _____ her homework.
2. They speak French. (改为一般疑问句)
_____ they _____ French?
3. Where is Sam from? (改为同义句)
Where _____ Sam _____ _____?
4. The child doesn't have lunch at home. (改为主语为复数意义的句子)
The _____ _____ have lunch at home.
5. Tom likes bananas. (改为否定句)
Tom _____ _____ bananas.
东南亚地区的马六甲海峡运输繁忙，它是沟通哪两大洋的咽喉要道（ ）
A．印度洋、大西洋
B．大西洋、北冰洋
C．印度洋、太平洋
D．太平洋、大西洋
