Could you tell me_________？

A．where is the headmaster

B．whose camera it is

C．what Jack was happened

D．how long does it take you to your school?

737飞机上配备的两种类型的PBE分别是（）

A.美式白色盒子

B.美式绿色盒子

C.欧式白色盒子

D.欧式绿色盒子