The silk dress shows social structure because only upper classes were allowed or able to get it. For example, you probably won't see a slave wearing an expensive silk dress.

The oracle bone shows writing because the people write all over bones to ancestors or prayers or even fortunes.

The bronze face shows art because it is a decorated creation hat probably meant something. Also it is made of bronze.

The statue of the soldier shows government because the military or army is part of the government.

The ritual disc shows religion because it was used in religious rituals.

The shovel head shows technology because shovels were used for farming and it probably made it easier.