Final answer:
The statement is false; while high-voltage wires are held up by towers using insulating connectors, the wires themselves are not wrapped in insulating material but are left bare because open air provides sufficient insulation.
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 wires, also known as power lines or transmission lines, are indeed held aloft by tall towers and are connected to these towers through insulating connectors to prevent the electric current from flowing into the towers. However, contrary to what the question suggests, these wires are not wrapped in insulating material; they are left bare.
Conductors for transmitting electricity at high voltages are not covered with insulation because the air around them provides sufficient insulation. Another reason for not using an insulating cover is that it would be impractical and expensive for long distances, given the size and length of these conductors, and can lead to overheating of the wires. Thus, the key reason for keeping these wires bare is reliability, cost-effectiveness, and because open air provides good insulation at high altitudes.