Final answer:
The high-voltage wires are held aloft by insulating connectors but are not wrapped in insulating material; the statement is false.
Step-by-step explanation:
The statement that the high-voltage wires connected to tall metal-frame towers are held aloft by insulating connectors and are wrapped in an insulating material is false. High-voltage wires are indeed suspended by insulators to prevent electrical current from traveling down the towers to the ground, which would be dangerous and defeat their purpose. However, these wires are not typically wrapped in insulating material. The air around them acts as the insulator. The materials for these insulating connectors are designed to withstand the environmental and electrical stresses without conducting electricity.