客舱照明灯光是由（）供电的。
A.勤务汇流条
B.热电瓶汇流条
C.应急汇流条
D.以上都不对
参考答案：A
---You’re late! You were ____to be here an hour ago.
--- Sorry, Mr. Hu.
A．sorry
B．surprised
C．supposed
D．happy
