全口义齿的前牙要排列成浅覆牙合、浅覆盖的目的是为了（）
A.排牙方便
B.美观
C.易于取得前伸胎平衡
D.发音清晰
E.与天然牙一致
参考答案：C
Ben asked ______ I was going to the beach the next day. [ ]
A. if
B. that
C. what
D. When
乳突线
