根据对话意思和所给首字母，写出完整正确的单词

A: Hello, what can I do for you?

B: I want to buy a (1) p______________ for my mother because Mother's Day is coming.

A: There are many (2) c______________ scarves here. I'm sure your mother will like them.

B: Great! … How much is it? It's very beautiful. And purple is her (3) f______________.

A: It costs ￥90.

B: Oh, it's too expensive. Do you have a (4) c______________ one?

A: What about this blue one? It's only ￥50. And blue can (5) m____________ any other colour.

B: I agree. OK. I'll take it.

2009年，H1N1流感在人群中传染，引起党和政府的高度关注．请问H1N1流感的病原体属于（　　）

A．植物

B．动物

C．细菌

D．病毒