— I think our English teacher is working hard. He teaches us           .

— Yes, but he hasn't come today. He doesn't feel           . [ ]

A. good; well

B. good; good

C. well; good

D. well; well

如果起飞重量受刹车能量限制，上坡会导致（）

A.无影响

B.减少起飞距离

C.增加最大起飞重量

D.减少最大起飞重量