Final answer:
The statement regarding high-voltage wires being insulated is false; they are bare and held by insulating connectors, with the air providing insulation.
Step-by-step explanation:
The claim that the high-voltage wires connected to tall metal-frame towers are wrapped in insulating material is false. These wires are actually bare and are not covered by any insulating material. They are held aloft by insulating connectors, which prevent the electric current from traveling down the towers into the ground. The air around the wires acts as insulation. This is practical because the high altitude reduces the risk of someone or something accidentally coming into contact with the wires.