—  A Boeing 777-200 plane became lost in communication (失去联系) at midnight       the early morning of March 8th．   

—I was amazed(震惊) to hear that.

A．on

B．in

C．at

D．of

临时用房建筑面积之和大于（）㎡时，应设置临时室外消防给水系统

A、1200

B、1100

C、1000

D、1300