问题
单项选择题
对某氟牙症患者进行Dean氟牙症分类，其牙列中受损害最重的3颗牙描述如下：有1颗牙釉质有明显磨损，另2颗牙釉质白色不透明区占牙面40%，棕染。该患者的Dean分类为
A．0.5
B．1
C．2
D．3
F 4
答案
参考答案：C
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对某氟牙症患者进行Dean氟牙症分类，其牙列中受损害最重的3颗牙描述如下：有1颗牙釉质有明显磨损，另2颗牙釉质白色不透明区占牙面40%，棕染。该患者的Dean分类为
A．0.5
B．1
C．2
D．3
F 4
参考答案：C
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| Mary and Donald Smith lived in the same building. Donald 1 a toy company. One day Donald gave Mary. the 4-year-old girl. a new toy. She played with it and said. "This is fun! A few weeks later Donald gave her 2 toy. She played with it and then said."I'm not 3 in this toy. It doesn't work." For years Donald gave Mary new toys. and she gave him very good 4 about the toys. When Mary was 13 years old. Donald showed her a new ball. Mary wanted to 5 the ball with small stones to make it 6 .The company made this change. Mary's idea was a great success! The company sold thousands of the balls. That Christmas. Donald gave Mary an 7 gift. He made her vice-president (副总裁) of the toy company. She made $200,000 a year. Her job was to see 8 the new toys were fun. She worked 9 three or four hours a day at her job, then she had to do her homework. Today Mary works at a college. The little vice-president with bright ideas helps students think about their 10 . | ||||
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