It is generally believed that teaching is ____ it is a science.
A. an art much as    B. much an art as
C. as an art much as  D. as much an art as

23.   -Have you learned German?
-Yes. It's ___ language I've ever learned.
A. a quite difficult  B: quite a difficult 
C. difficult quite   D. difficult a quite

24.   I’m afraid I’ll turn to Prof. Timlingson. It is        .
A. too difficult a problem B. a too difficult problem
C. so difficult problem   D. a so difficult problem

考点4.     可数名词单数不能单独使用

要么前面加上冠词, 要么前面加上指示代词或物主代词，要么用为复数。

This is pen. (错误。pen是可数名词单数，不能单独使用。)可改为：

This is a pen.

This is the pen.

This is his/her/my/their pen.

This is that pen.

These are pens.

考点5.     一些短语中

25.   --- Hey, Mr. Smith, you are wanted

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