下颌第一磨牙髓室顶最凹处约平齐于( )A．冠、中1/3交界处 B

搜题请搜索小程序“爱下问搜题”

问题单项选择题

下颌第一磨牙髓室顶最凹处约平齐于( )

A．冠、中1/3交界处

B．颈缘上2mm

C．颈缘

D．颈缘下2mm

E．根分叉处

答案

参考答案：C

解析：下颌第一磨牙髓室顶最凹处约平齐于颈缘，髓室底在颈缘下2mm。

填空题

根据句意和首字母提示每空填一个单词，使句意完整。

1. Titanic is very s_________. Many people like it.

2. My c_________ study in No. 1 Middle School.

3. The n_________ month of the year is S_________.

4. C_________ make people laugh.

5. Can you play the t_________?

6. My brother often g_________ to bed at a_________ ten o'clock.

7. Are you f_________ this afternoon?

8. His favorite s_________ is P.E..

9. I have eight classes on W_________.

10. I have no classes on w_________.

单项选择题

从所给的四个选项中，选择最合适的一个填入问号处，使之呈现一定的规律性。（）

A.选项A

B.选项B

C.选项C

D.选项D