Why were the first light bulbs impractical? A. They lasted only a short time B. Glass was too expensive for light bulbs C. Electricity wasn’t widely available D. They were too expensivĐoạn văn61/80Why were the first light bulbs impractical?They lasted only a short timeGlass was too expensive for light bulbsElectricity wasn’t widely availableThey were too expensiveGiải thíchĐáp án: A