容易导致咀嚼食物时全口义齿脱位的是
A．义齿基托过薄
B．垂直距离过低
C．牙槽嵴有压痛
D．咬合接触不平衡
E．义齿初戴后恶心
参考答案：D
The teacher asked Tom _________.
A．why he was late for school
B．why was he late for school
C．why is he late for school
D．why he is late for school
如果一个三角形的底边长增加10%．底边上的高缩短10%，那么这个新三角形的面积是原来三角形面积的( )。
A．90%B．80%C．70%D．99%
