《射雕英雄传》中有这样一个情节：全真七子丘处机为两个孩子取名郭靖、杨康，目的是为了让他们勿忘国耻。“国耻”指（     ）

根据首字母提示补全对话

(An old woman is standing at the side of the road, near the traffic l____ . Liu Mei is on her way to the cinema, but she stops. )

Woman: Oh, dear! What shall I do?

Liu Mei: What's the m____ , Granny? Can I help you?

Woman: I'm on my way to see my h____ . He's ill in hospital.

Liu Mei: Which hospital?

Woman: I don't know! The address was on a p____ of paper, but I can't find it now.

Liu Mei: Is it in your pocket? M____ you put it there.

     (The woman finds the paper.)

Woman: Could you tell me how I can get to the hospital? I don't k____  the way. Which is the way to the hospital?

Liu Mei: Go down this street until you r____ the second traffic lights. Turn right; at the end of the r____ you'll see the hospital. It'll take you about half an hour.

Woman: Half an hour? That's too l____ ! Is there a bus?

Liu Mei: Yes, the No. 72 bus will take you there. There's a stop right o____ the hospital. I'll go with you.

Woman: How kind you are! Thank you.

已知y=a﹣bcos3x（b＞0）的最大值为$\frac{3}{2}$，最小值为﹣$\frac{1}{2}$，求函数y=﹣4asin（3bx）的周期、最值及取得最值时的x，并判断其奇偶性．