施工途中行车时,不要将头、手伸出窗外。
参考答案：对
人说话时声带在______，拉胡琴时琴弦在______．这些现象说明，一切发声的物体都在______．
When _____, the wholesale vegetable market will be the largest one in China. [ ]
A. completed
B. completing
C. to be completed
D. being completed
