风湿性心瓣膜病二尖瓣狭窄患者，如闻及开瓣音，表示其病理改变为（）

A.瓣膜明显增厚

B.漏斗型

C.隔膜型

D.二尖瓣狭窄伴关闭不全

E.联合瓣膜病变

You can read this kind of English novel because there are _________ new words in it.

[      ]

A. a little

B. a few

C. little

D. few