— Do you know what Millie and Andy were doing at 8 o'clock yesterday? 

— While Millie _____ TV, Andy _____ a book in the bedroom. [ ]

A. was watching; was reading

B. watched; read 

C. was watching; read

D. watched; was reading

远动装置（RTU）可靠性包括哪些方面（）

A.装置本身的可用性

B.信息传输可靠性

C.装置正常运行的能力

D.远动装置的平均故障间隔时间