问题
单项选择题
窝洞的外形线需要制成圆缓的曲线，主要目的是为了
A．防止充填物脱落
B．防止边缘继发龋的出现
C．达到良好的美观效果
D．防止牙体折裂
E．防止充填物的折裂
答案
参考答案：D
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窝洞的外形线需要制成圆缓的曲线，主要目的是为了
A．防止充填物脱落
B．防止边缘继发龋的出现
C．达到良好的美观效果
D．防止牙体折裂
E．防止充填物的折裂
参考答案：D
| Read and choose. 完形填空。 |
| Li Ming l to the library three 2 a week, from Monday to 3 . 4 school, he walks home. He does his homework. 5 6:30 in the evening, he eats 6 . After supper, he washes his hands and brushes his 7 . Then he puts 8 his clothes 9 goes to the library. He is a good boy. He works very 10 . |
( ) 1. A. go | B. goes B. time's B. Wednesday B. After B. To B. lunch B. teeth B. in B. but B. hard | C. went C. times C. Thursday C. At C. In C. supper C. face C. too C. and C. good |