由双线改单线行车时，须经（）准许并发布命令。
A、列车调度员
B、车站值班员
C、值班主任
D、值班站长
参考答案：A
从者反治
补全对话
A: __1_
B: I'm not feeling well.
A: _ 2 _
B: No, I don't.
A: Do you have a ferver?
B: Yes, I think so.
A: 3
B: This morning.
A: That's too bad. 4 . I hope you will feel better tomorrow.
B: 5
A: When did it start?
B: Thanks.
C: Do you have a sore throat?
D: What's the matter?
E: You should take some medicine
