— Hi, Linda. I didn’t see you at the party last night.

— Oh, I              ready for the math exam all the time.

A．have got

B．am getting

C．got

D．was getting

翼型的零升阻力包括（）

A.粘性摩擦阻力

B.粘性压差阻力

C.干扰阻力

D.诱导阻力