---It is reported that a Boeing 777-200 plane became lost in communication (失去联系) at midnight __________ the early morning of March 8th．

---I was amazed to hear that.

A．at

B．in

C．on

D．of

在“通道”面板中，当出现（）图标时，则显示该通道的信息，反之隐藏该通道。

A.A

B.B

C.C

D.D