—"Where is your mother?"

—"_____" [ ]

A. She works in a factory.

B. She is in the kitchen, she's cleaning.

C. She is a teacher in No.1 Middle School.

D. She 1ikes watching TV .

施行简略试验时，列车后部现场检车员只需要确认最后一辆车发生制动作用。