They are becoming more and more interested ___physics.

问题描述:

They are becoming more and more interested ___physics.
请问为什么要填in?是不是有什么固定搭配?
还有整句话的意思是什么呀

become / be interested in 对……感兴趣 [固定词组]
整句的意思:他们对物理越来越感兴趣了.