平面是指()
A.一个真实存在的平面
B.此平面前端高于后端
C.处于颌间距离的中点
D.以上颌牙列为基准
E.是个假想水平面
参考答案:C
Recently my father bought an ancient Chinese vase, _____ was very reasonable.
A.which price
B.the price of which
C.its price
D.the price of whose
They all()the job
A.asked after
B.asked for
C.asked to
D.asked with