拆除工程施工应（）。
A.从上至下
B.从左至右
C.逐层实施
D.分段实施
E.立体交叉作业
参考答案：A, C, D
The meeting _______ by the time I got there yesterday. [ ]
A. was on
B. has been on
C. had begun
D. has begun
产于河南的道地药材是（）
A.附子
B.薄荷
C.细辛
D.阿胶
E.地黄
