2. Read and choose

A.But where does the water come from?
B.What do you know about it?
C.What else do you want to know about it?
D.But how do we make power from water?

Alice: Hi, Peter. Look at this picture. It's the Baihetan Dam(大坝).
Peter: Maybe we can choose water power for our project. 1)
Alice: I know it gives us clean energy. 2)
Peter: Umm, the internet says it comes from the Jinsha River.
Alice: I see. 3)
Peter: Look here! The water falls down from a high place. It moves fast to run machines(机器). That's how we make electricity.
Alice: Wow! Water can do so much!
Peter: Exactly! 4)
Alice: Hmm ... How does the electricity get to our homes?
Peter: Let's watch a video to find out.

1)B 2)A 3)D 4)C

1) 根据Alice的回答“I know it gives us clean energy.”，可知此处是询问对方对水力发电的了解，选B。
2) 根据Peter的回答“it comes from the Jinsha River.”，可知此处是询问水的来源，选A。
3) 根据Peter讲解水力发电的运行原理，可知此处是询问如何用水获取电力，选D。
4) 根据Alice后续提出新的相关疑问，可知此处是询问对方还想了解该内容的其他方面，选C。