问题
补全对话，情景问答
| 读一读，选一选，完成对话。 | |
B: 1__________________________________________ A: Forty. B: 2__________________________________________ A: Yes, we have. B: 3__________________________________________ A: It's on the first floor. 4________________________ B: Yes, we have lunch at school. |
答案
1-4 D A B C
缺失，
弯制卡环，舌侧为塑料基托连接的义齿蜡型，采用混装法装入型盒，常规去蜡，充填，磨光。