问题
单项选择题
后堤区的作用是（ ）。
A．基托后缘定位
B．边缘封闭作用
C．支持作用
D．排牙标志
E．缓冲作用
答案
参考答案：B
搜题请搜索小程序“爱下问搜题”
后堤区的作用是（ ）。
A．基托后缘定位
B．边缘封闭作用
C．支持作用
D．排牙标志
E．缓冲作用
参考答案：B
| Look at the pictures and choose the correct answers. 看图，选择正确答案。 |
| ( )1. — ? —She is hanging up the phone. A. What is Jenny doing? B. What does Jenny do? C. What did Jenny do? |  |
| ( )2. —Where is she? — . A. She's washing vegetables. B. She's in the store. C. She's in the kitchen. |  |
| ( )3. —What's Danny doing? — . A. He's talking on the phone. B. He's making a call. C. He makes a call. |  |