The answer       the teacher，she asked the little boy to try a second time．

A．disappointed

B．disappointing

C．being disappointed

D．having been disappointed

飞机灯光照明系统可分为（）.

A、机内照明和机外照明

B、机内照明、机外照明和应急照明

C、普通照明和航行标志照明

D、客舱照明和驾驶舱照明