题目

9的平方根是_________． 答案：【答案】±3【解析】根据平方根的定义解答即可．∵（±3）2=9，∴9的平方根是±3．故答案为：±3．Tomorrow we will have fine weather, with temperatures ________ between-2℃ and 5℃．A.changingB.rangingC.turningD.rising