固定桥受力后，基牙会产生负重反应，故要求固定桥的基牙应该是A

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问题单项选择题

固定桥受力后，基牙会产生负重反应，故要求固定桥的基牙应该是

A．牙冠长而大，形态正常

B．牙体组织健康

C．牙周条件好

D．活髓基牙

E．与邻牙接触关系良好

答案

参考答案：C

填空题

请结合上下文将下列句子补充完整。

1. — What does he usually do at 5: 00? — He usually _____________ football.

2. — When do you go to school? — I often _____________ to school at 7: 30.

3. — What does Lily have for lunch on Sundays? — She _____________ tomatoes and eggs for lunch.

4. — Does your father go to work by car? — No, he _____________. He _____________ to work on foot.

填空题

已知一元二次方程x²+px+3=0的一个根为-3，则p=（）。