平时义齿不掉，进食时义齿易脱位（）
A.垂直距离过高
B.垂直距离过低
C.边缘伸展过长
D.咬合不平衡
E.覆盖过小
参考答案：A
—Let’s ________ this weekend.
—Good idea! Jay Zhou is my favorite singer.
A．play tennis
B．go to the doctor
C．have soccer training
D．go to the concert
中性轴
