Teaching is an art ________ on a science.

1. A.
   written
2. B.
   came
3. C.
   based
4. D.
   expressed

Teaching is an art ________ on a science.

[　　]

As everybody knows,teaching is________as it is science.

1. A.
   as much an art
2. B.
   as a much art
3. C.
   much as an art
4. D.
   as an art much

同义句转换

Teaching is an art which is based on science.

Teaching is an art________ on science.