题目

A:Would you like to come to my birthday party?B: 【1】A: When is it?B: 【2】A: What do you usually do at a birthday party?B: 【3】A: Do you sing Happy Birthday?B: 【4】A: Who is coming too?B: 【5】A.This Saturday.B.Yes,I'd love to.C.Betty.D.Yes, we sing it in English.E.We usually eat birthday cake. 答案：【答案】【1】B【2】A【3】E【4】D【5】C【解析】本文是A、B两人的对话，A和B沟通是否去参加生日聚会以及在生日聚会上准备做什么。【1】根据上文“Would you like to come to my birthday party?”可知，此处是问你想要来我的生日聚会吗，结合选项，可推断此处回答应是“是的，我很乐意”。故选B。【2】根据上已知函数f（x）=lnx，g（x）=12ax2+bx，a≠0．（Ⅰ）若b=2，且h（x）=f（x）-g（x）存在单调递减区间，求a的取值范围；（Ⅱ）设函数f（x）的图象C1与函数g（x）图象C2交于点P、Q，过线段PQ的中点作x轴的垂线分别交C1，C2于点M、N，证明C1在点M处的切线与C2在点N处的切线不平行．