题目

补全对话。A： B：Hello．Tom．A： B：Yes．It's my favourite sport．A： B：But it is hot today．A：Let's play it tomorrow．B： A：Cool.B：OK． A：See you!A.Let's play it after school．B.What's the weather like tomorrow?C.Hi, Jim．D.See you tomorrow．E.Can you play football? 答案：【1】C【2】E【3】A【4】B【5】D已知函数f（x）=x3+ax2-2x+5．（Ⅰ）若f（x）在区间（-，1）上单调递减，在区间（1，+∞）上单调递增，求实数a的值；（Ⅱ）求正整数a，使得f（x）在区间（-3，）上为单调函数．