问题 问答题 简答题

如何通过牙齿检验进行个识别?

答案

参考答案:

牙齿的个人识别主要通过以下检验鉴定:

(1)牙齿的性别鉴定:用牙髓腔内的牙髓组织细胞作X、Y染色质检验,确定牙齿的性别。此外,还可根据牙齿的形态大小判定性别。

(2)牙齿的年龄鉴定:根据人的乳牙和恒牙有一定的萌出时间和顺序,可用于年龄推断。根据牙齿咬合面的磨损程度随年龄的增长而不断加重,因而可作为推测年龄的依据。但牙齿的磨损程度还受种族、地区、食物种类、生活习惯、疾病等因素影响,在鉴定时应注意。

(3)牙齿的血型和DNA检验:牙齿的血型检验最好是用牙髓组织作为检材,可检出ABO、MN等血型。若牙髓已腐烂,可用牙垢检测ABO血型。也可将牙质磨成粉末,检测血型。牙髓组织细胞可提取DNA,检测其DNA指纹。

(4)牙齿的其他鉴定:根据牙齿的形态、排列、牙病及治疗情况和假牙的形态、质量、工艺等可作个体识别。通过拍摄尸体的牙齿的X光片,检验牙齿疾病和治疗情况,与死者生前就诊的医院或诊所的病案资料比对,可作死者身源的认定。

单项选择题
阅读理解

“Sesame Street” has been called “the longest street in the world.” That is because the television program by that name can now be seen in so many parts of the world. That program became one of American’s exports soon after it went on the air in New York in 1969. 

In the United States more than six million children watch the program regularly. The viewers include more than half the nation’s pre-school children, from every kind of economic, racial(种族的), and geographical group. 

Although some educators object to certain elements in the program, parents praise it highly. Many teachers also consider it a great help, though some teachers find that problems arise when first graders who have learned from “Sesame Street” are in the same class with children who have not watched the program. 

Tests have shown that children from all racial, geographical, and economic backgrounds have benefited from watching it. Those who watch it five times a week learn more than occasional(偶尔的)viewer. In the US the program is shown at different hours during the week in order to increase the number of children who can watch it regularly. 

The programs all use songs stories, jokes and pictures to give children a basic understanding of numbers, letters and human relationships. But there are some differences. For example, the Spanish program, produced in Mexico City, devotes more time to teaching whole words than to teaching separate letters. 

Why has “Sesame Street” been so much more successful than other children’s shows? Many reasons have been suggested. People mention the educational theories of its creators, the support by the government and private businesses, and the skillful use of a variety of TV tricks. Perhaps an equally important reason is that mothers watch it along with their children. This is partly because famous adult stars often appear on it. But the best reason for the success of the program may be that it makes every child watching feel able to learn. The child finds himself learning, and he wants to learn more. 

小题1: “Sesame Street” is actually______. 

A.a street in the US

B.a program for children

C.a program of teachers

D.a program for students小题2:Children who often watch the program______. 

A.can have problems in school

B.will find it a great help

C.will take no interest in their studies

D.will be well educated小题3:What is special about the program?

A.It offers great fun. 

B.It makes children feel able to learn. 

C.It is shown at different hours during the week. 

D.Children learn and enjoy themselves while watching. 小题4:Why is “Sesame Street” so popular in the world?

A.Because it is supported by the government and businesses. 

B.Because it uses a variety of skillful tricks. 

C.Because mothers watch it along with their children. 

D.Because it makes every child watching it feel able to learn. 小题5:The best title for this passage can be______. 

A.TV Programs

B.Educating Children

C.Sesame Street

D.A Greet Success