Educational/test-prep register discussing English grammar study. 使い分け 'distinguishing use / proper use of' is the noun form of the compound verb 使い分ける, common in language-learning and style guides. 問う 'to ask' is a formal verb for questioning, commoner than 聞く in academic contexts. セクション is a loanword, and には combines dative/locative に with topic-contrastive は.