有关亚洲地形的叙述正确的是[ ]

A、地势中部高，四周低　　　

B、地形以平原为主

C、平均海拔最高　　　　　　

D、地势西北高，东南低

The student was just about to_________ the question,when suddenly he found the answer.

A．arrive at

B．work out

C．stick to

D．give up