横向结构物两端的过渡段填筑必须（）进行，并应与相邻路堤同步施工。
A、分开
B、先一侧在另一侧
C、对称
D、随便
参考答案：C
提出情绪辅导方法的心理学家是( )
A．斯金纳
B．巴甫洛夫
C．艾里斯
D．雅各布松
I took the wrong train . I didn't even know it until half an hour later. [ ]
A. by mistakes
B. by mistake
C. with mistake
D. with mistakes
