团购，指认识或不认识的消费者联合起来，加大与商家的谈判能力，以求得最优价格的一种购物方式。当团购人数没有达到最低限度时，用户为了购买到自己想要的商品会主动邀请身边的朋友一起购买，以增加人数。这表明（  ）

如图，抛物线y=（x﹣1）²+n与x轴交于A，B两点（A在B的左侧），与y轴交于点C（0，﹣3），点D与点C关于抛物线的对称轴对称．

从每题A、B、C、D四个选项中，选出一个最佳答案完成对话。
A: Good morning , Joe .
B: Good morning , Peter .
A: You look unhappy , what's wrong ?
B: Oh, 1 I don’t look cool .
A: Well , maybe you should buy some clothes .
B: Yes , but 2
A: Hmm, maybe you could get a part-time job in the evenings.
B: I can’t , because my parents want me to stay at home every night .3
A: Well , you shouldn’t argue with your parents .You should talk about your problems .
B: And guess 4
A: What?
B: My brother plays his CDs too loud! 5
A: I'm sorry to hear that .