Why bioenergy is clean energy ?Because there is no （ ）during combustion.
举一反三
- The bioenergy is also called clean energy because it doesn't produce_________. A: exhaust gas B: oxygen C: hydrogen D: nitrogen
- More and more people ____ the new energy because it is clean and cheap.
- People are beginning to use clean energy sources mainly because _______.
- The main technical fields of intelligent power generation are () . A: Renewable Energy; New Energy; Large Capacity Energy Storage<br/>Application B: Conventional Energy; Renewable Energy; Clean energy C: Conventional Energy; Renewable Energy; Clean Energy D: New Energy; Clean Energy; Large Capacity Energy Storage Application
- 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