题目

从方框中选择最佳选项完成对话，有两项多余A. What are you doing at the moment?B. Where are you?C. He is shopping for presents.D. I am enjoying the school trip.E. Bye.F. He is waiting for you.G. Can you hear me?A: Hi, mum. B: Yes, I can.A:B: In Hong Kong Disneyland(香港迪斯尼乐园).A: Great!B: I’m taking a lot of photos. There are many funny things here.A: What is dad doing?B: There are many lovely presents.A: I hope you and dad have a great time.B: Thank you!A: Bye bye.设函数f（x）=ln（x﹣1）+ax2+x+1，g（x）=（x﹣1）ex+ax2 ， a∈R． （Ⅰ）当a=1时，求函数f（x）在点（2，f（2））处的切线方程；（Ⅱ）若函数g（x）有两个零点，试求a的取值范围；（Ⅲ）证明f（x）≤g（x）