题目

I still cannot believe how comfortable I was when the dentist was treating my teeth. ______ being aware that there was someone doing something in my mouth, I didn’t really feel a thing.（  ） A. In addition      B. Rather than       C. Apart from     D. Except from   答案：C  8．函数$f（x）=ln（4+2x）+\sqrt{81-{3^x}}$的定义域为（-2，4]．