问题
单项选择题
对乳牙列及混合牙列早期前牙深覆盖描述错误的是（）
A.多是牙性、功能性的
B.磨牙多为安氏Ⅱ类
关系
C.可能为上切牙间隙、上切牙间多生牙、下切牙先天缺失
D.可能为侧切牙舌向错位、上尖牙区宽大
E.大多伴有深覆、下颌后缩
答案
参考答案：D
解析：乳牙列及混合牙列早期前牙深覆盖可表现为上尖牙区狭窄可能。
搜题请搜索小程序“爱下问搜题”
对乳牙列及混合牙列早期前牙深覆盖描述错误的是（）
A.多是牙性、功能性的
B.磨牙多为安氏Ⅱ类关系
C.可能为上切牙间隙、上切牙间多生牙、下切牙先天缺失
D.可能为侧切牙舌向错位、上尖牙区宽大
E.大多伴有深覆、下颌后缩
参考答案：D
解析：乳牙列及混合牙列早期前牙深覆盖可表现为上尖牙区狭窄可能。
| 补全对话。 | |
| A: Mr. Fred, you often help children. 1 B: Yes, of course. Children often write to me and ask me how to solve their problems. A: 2 B: Many can't decide when to study and when to play. I think they should learn to achieve a balance between study and play. A: I agree. Sometimes I get too much homework and 3 B: You must feel stressed from time to time, right? A: Yes. Can you give me some advice? B: OK. 4 A: I see. Any more? B: Yes. You can also get help from youth workers at your own school. A: Thanks for your advice. B: 5
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