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604. Which TWO of the following are correct descriptions of eco-friendly driving practices?
- It is related to the Kyoto Protocol, which stipulates targets for reducing greenhouse gas emissions.
- Substances that cause air pollution include hydrocarbons, carbon monoxide, carbon dioxide, and nitrogen oxides.
- To increase the temperature inside the vehicle, start the engine and let it idle for a long time.
- Inspect the vehicle frequently and replace the engine oil every 2,000km driving distance.
Answer : 1, 2