搜题请搜索小程序“爱下问搜题”
问题 单项选择题

属于口腔黏膜固有层的细胞是（）

A.角质形成细胞

B.成纤维细胞

C.黑色素细胞

D.梅克尔细胞

E.朗格汉斯细胞

答案

参考答案：B

解析：试题难度：易；此题是关于口腔黏膜结构的基本知识题。5个备选答案中，角质形成细胞、黑色素细胞、梅克尔细胞、朗格汉斯细胞均见于黏膜上皮中，唯有成纤维细胞见于结缔组织性质的黏膜固有层，而且是固有层的主要细胞成分。故正确答案应选B。

改错题
此题要求改正所给短文中的错误。对标有题号的每一行作出判断：如无错误，在该行右边横线上画
一个勾（√）；如有错误（每行只有一个错误），则按下列情况改正：
此行多一个词：把多余的词用斜线划掉，在该行右边横线上写出该词，并也用斜线划掉。
此行缺一个词：在缺词处加一个漏字符号（∧），在该行右边横线上写出该加的词。
此行错一个词：在错的词下画一横线，在该行右边横线上写出改正后的词。
注意：原行没有错的不要改。
    I have a good friend who's name is Liu Mei. She is our        
monitor and one of the excellent students on our class.     
Although she is clever, but she works very hard. We have a    
lot on common and have a lot to talk about. One evening she   
told me that something happened when her parents out.    
She was doing her homeworks one Sunday morning when         
she smelt something burning. She stopped look out          
of the window and find a cloud of smoke coming out          
of her neighbour's house. She called 119 immediate. Ten     
minutes later, the firemen came and put out fire. Her neighbour
was very thankful for her help.                                 		1.______          
2.______            
3.______       
4.______        
5.______         
6.______                                          
7.______       
8.______       
9.______      
10.______  

查看答案
单项选择题

杂交玉米种子的发芽率，国家强制标准不低于（）。

A．75%

B．80%

C．85%

D．90%
查看答案