U3T204. Almost 90 percent of the world's energy is supplied through the ______ of fossil fuels,
举一反三
- People are beginning to use clean energy sources mainly because _______. A: fossil fuels have caused a lot of pollution B: clean energy is cheap C: fossil fuels have cost a lot of lives D: they do not have enough fossil fuels now
- Fossil fuels like coal, oil and natural gas are non-renewable energy sources.
- We have to prepare for a new age of energy synthesis since fossil fuels will be eventually depleted.
- Before fossil fuels were exploited and applied on a large scale, ( ) the main source of energy in ancient China.
- Human beings have been depending heavily on fossil fuels to meet their increasing energy demands since the Industrial Revolution.