选择可摘局部义齿基牙的原则中，不恰当的是（）。
A.选择健康牙作基牙
B.虽有牙体疾病，但已经治疗
C.虽有牙周疾病，但已得到控制
D.越近缺隙的牙作基牙固位，支持效果越好
E.选用多个基牙时，彼此越平行义齿固位越好
参考答案：E
解析：应选E。因为可摘局部义齿选用多个基牙时，彼此越平行，基牙近远中向、颊舌向倒凹区越小，义齿固位就越差。此时要用调凹法使缺隙侧基牙的倒凹适当地集中在个别牙上，义齿必须斜向就位。
Growing up is not always easy. When we face difficulties, a spirit of depending on _ is more useful than crying for help. That’s what Hong Zhanhui’s story of growing from boy to man family hardship tells us. Hong was born in 1982 in a poor family in Xihua County(县), Henan Province. When he was only 11, his father became badly ill and one day he came back with an unwanted baby . A year later, Hong’s mother home. She no longer wanted to live such a poor life and face her sick husband. So everything hard fell onto the young boy’s : to take care of his father and the younger sister Chenchen, and to go on to study. Although his life was hard, Hong didn’t go away from his father and sister. He took several part-time jobs to his family. He climbed tall trees to get birds’ eggs for his sister. He walked 2 hours at weekends to the market to different things to sell around his school. A few years later, he studied at a college. To take care of Chenchen, he worked hard to a room near his college for her, and sent her to school. After Hong’s story went , he became a hero in people’s eyes. But Hong ___ ___ offers from others. He said he felt encouraged by kind offers, but he could depend on his own work. Through his hard life, he has grown up from boy to man.
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