The earlist use of geothermal energy can be traced back to ( ).
举一反三
- The tradition of setting off fireworks can be traced back to ____
- The history of British pubs can be traced back to Roman taverns.
- In China, debate can be traced back as early as the ______ and the Warring States Period
- Diaolou of the Qiangs has a long history, which can be traced back to the _____ Dynasty.
- The origins of modern public speaking can be traced back to ancient Greece and Rome. ( )