附加题：若a=$\frac{2007}{2008}$，b=$\frac{2008}{2009}$，试不用将分数化小数的方法比较a、b的大小．观察a、b的特征，以及你比较大小的过程，直接写出你发现的一个一般结论．

Waiter: Good morning! May I help you?

Ann: Yes, please. I want a hamburger and some salad(沙拉).

Waiter: Drinks?

Ann: A cup of tea.

Waiter: With ice(冰)?

Ann: Yes, thank you.

Waiter: What do you like, sir?

Tom: Just a big glass(杯)of Coke(可乐)with ice, please.

Waiter: Do you want to eat any food?

Tom: No, I don't want to eat anything.

Waiter: How about you?

Amy: I want some rice and fish, and a glass of milk.