Final answer:
The statement about high-voltage wires being insulated is false. They are supported by insulators but are not wrapped in insulating material as insulation is impractical for such long distances.
Step-by-step explanation:
The statement that 'the high-voltage wires that you see connected to tall metal-frame towers are held aloft by insulating connectors, and these wires are wrapped in an insulating material' is false. High-voltage transmission lines, although supported by insulators to prevent energy loss and protect the towers from electrical current, are not wrapped in insulating material. The wires are bare because they are well above the ground and anything they could come into contact with, negating the necessity for insulation around the wire itself. Insulation would be impractical and costly for high-voltage long-distance transmission due to the immense length of the wires and the difficulty in maintenance.