1. (2019·宁津模拟) What was invented by Thomas Edison according to the dialogue?

Thomas Edison was one of the greatest inventors.<br />I agree with you.<br />The light, invented by him, is the most valuable, I think.<br />Question.<br />What was invented by Thomas Edison, according to the dialogue?<br />Thomas Edison was one of the greatest inventors.<br />I agree with you.<br />The light, invented by him, is the most valuable, I think.<br />Question.<br />What was invented by Thomas Edison, according to the dialogue?