涂饰施工要求工艺精湛，其中占时最多的工序是：（）.
A.清除
B.嵌批
C.打磨
D.调配
参考答案：B
Miss Green isn't in the office. She to the library.[ ]
A. has gone
B. went
C. will go
D. has been
什么是环境统计？
