question: firewall: barbed wire fence
choices.label: A B C D
choices.text: radiator:electric blanket watch:compass memory:calculator jack-o'-lantern: energy-saving lamp
explanation: "firewall" and "barbed wire fence" have the same function, both have an isolation function. the function of "radiator" and "electric blanket" is the same, and both have the function of heating and keeping warm. the functions of "watch" and "compass" are different. "watch" has the function of timing and displaying time, and "compass" has the function of determining the orientation. "memory" and "calculator" have different functions. "memory" has a storage function, and "calculator" has a calculation function. "jack-o'-lantern" and "energy-saving lamps" have different functions. "jack-o'-lanterns" are used to celebrate the halloween holiday, and "energy-saving lamp" has the function of lighting.