根据对话，在与内容相符的图片下打"√"。

Sam: Hello, Amy .

Amy: Hello! Let's go to the playground.

Sam: OK. I like football. Do you like it?

Amy: No, I don't like football. I like basketball.

Sam: I see. I like riding bikes. Do you like it?

Amy: Yes, I like riding bikes and swimming.

Sam: What's your favourite toy?

Amy: I like dolls. What's your favourite animal?

Sam: I like tigers. How about you?

Amy: I like monkeys.

Sam

Amy

以下（）项不是汽水共沸的原因

A、炉水碱度过高

B、炉水含油或加药不当

C、水位过高

D、水位过低