人们生活中的衣、食、住、行均与化学有着密切的联系．

“等你考上大学，妈妈就享福了；等你毕业工作了，妈妈就享福了；等你结完婚，有了孩子，妈妈就享福了……”“奶奶，等我长大了，就让你享福啊!”央视的这则公益广告给我们的启示主要是（    ）

任务型阅读

　　There are some students in front of the lost and found box. The duty monitor Alan is asking some questions.

Alan: Jim, is this your English book?

Jim: No, it isn't.

Alan: Linda, is this your English book?

Linda: Yes, it is. Thanks.

Alan: Gina, what colour is your pencil?

Gina: It's green.

Alan: Is this your pencil?

Gina: Yes, it is. Thank you.

Alan: What is your name?

Jenny: My name is Jenny.

Alan: Is your ruler green or yellow?

Jenny: It's green. There’s my name “Jenny” on it.

Alan: Oh, here you are.

Alan: Here’s a nice bag; whose bag is this?

Paul: Let me see. . .  Oh, it's mine.

Alan: Look at the cute doll. Is this yours, Mary?

Mary: No, it isn't. I think it’s Betty's. Is there a watch in it?

Alan: Sorry, I haven’t seen it so far.

根据对话内容, 完成以下任务。

已知函数f（x）=alnx（a＞0），e为自然对数的底数．

（Ⅰ）过点A（2，f（2））的切线斜率为2，求实数a的值；

（Ⅱ）当x＞0时，求证：f（x）≥a（1﹣$\frac{1}{x}$）；

（Ⅲ）在区间（1，e）上$e^{\frac{x}{a}}$﹣e$e^{\frac{1}{a}}$•x＜0恒成立，求实数a的取值范围．