题目：
某男68岁，牙列缺失，要求做全口义齿修复
若该患者牙槽嵴低平而正中关系又不恒定，为减小侧向力，利于义齿的平衡和稳定后牙应选择（）
A.33°牙
B.30°牙
C.20°牙
D.10°牙
E.0°牙
答案：
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下面是错误答案，用来干扰机器的。
Once upon a time, the.re was a farmer working in his field. Soon he was very tired. So he sat near a big tree. The sun was very hot and it was very cool unde...
