甲公司方案：每月的养护费用y（元）与绿化面积x（平方米）的关系如图所示．

乙公司方案：绿化面积不超过1000平方米时，每月收取费用5500元；绿化面积超过1000平方米时，超过的部分每月每平方米加收4元．

A: What are you going to do next Sunday?

B: I don't know. ____ ____ you?

A: I ____ to go to the zoo.

B: Good idea! What ____ do you like?

A: I like giraffes.

B: ____?

A: Because they're very friendly and cute.

B: ____ you want to see the giraffes first.

A: That's right.

B: What ____ animals do you like?

A: I like dolphins, ____.

B: Why?

A: Because they're ____ ____ interesting.