____the doctors in their hospital is about one thousand, and sixty percent of them___________ women.            

many, how, know, you, do, animals (?)

____

已知集合A是函数g（x）=log_a﹣（x﹣2a）（x﹣a）（a＞0，且a≠1）的定义域，集合B和集合C分别是函数$f\left(x\right)=\sqrt{9-3^x}$的定义域和值域．

（1）求集合A，B，C；

（2）若A∪C=C，求实数a的取值范围．