choices.label: A B C D
choices.text: street:neighborhood industry:agriculture hardware:software study:work
explanation: the term 'rural' is used in contrast to 'urban', and refers to a place where workers mainly engaged in agricultural production live. the terms "rural" and "urban" are different. "neighborhood" is governed by "street", and "neighborhood" and "street" are somehow related. "industry" and "agriculture" are different industries engaged in production, and there are other industries besides "industry" and "agriculture". "hardware" and "software" are not the same substance but are important components of the same thing. "study" and "work" are different life states. besides "study" and "work", there are others.
relation: rural city R2.5
relation: neighborhood street R3.10
relation: industry agriculture R2.6
relation: hardware software R2.5
relation: study work R2.6