题目

Is there a pet hospital? (作肯定回答)_____________________________________ 答案：【答案】Yes, there is.【解析】问句句意：有宠物医院吗？Is there开头的一般疑问句，肯定回答是Yes, there is.故答案为Yes, there is.实数m取什么数值时，复数z=（m2+5m+6）+（m2-2m-15）i是纯虚数．