题目

    Jane was lying in bed waiting for an operation, nervous and worried. Just then another patient was ____41____ into the ward (病房). After a brief greeting, Jane struck up a(n) ____42____. The 80-year-old newcomer was named Sue. Her son ____43____ ran a company and her daughter worked on a TV station. Since her children were too ____44____ to take care of Sue, she lived in an old people's home. Sue was proud of the ____45____ of her children. Jane really ____46____ Sue. Compared with Sue, Jane was ____47____ but an ordinary country woman whose children were just ordinary worke已知函数f（x）=x3+3ax2+3（a+2）x+1既有极大值又有极小值，则实数a的取值范围是    ．