The fire started in the basement and quickly____________ to the first floor

where it destroyed all the______________ in the language lab.

A．was spreaded;furniture and equipments

B．was spreaded ;furniture and equipment

C．spread;furnitures and equipments

D．spread ;furniture and equipment

活塞式飞机着陆滑跑的减速力主要是（）

A.放襟翼产生的空气阻力

B.刹车时增大的地面摩擦力

C.发动机的反推力