散布轨枕时，按（）散布轨枕。
A.每根钢轨下应配备轨枕数量
B.任意数量
C.1米间距
D.2米间距
参考答案：A
Sally's never seen a play in the Shanghai Grand Theatre, _____? [ ]
A. hasn't she
B. has she
C. isn't she
D. is she
