The synonym of CO2 is .（ ）。
A: hydrogen
B: carbon monoxide
C: carbon dioxide
D: oxygen
A: hydrogen
B: carbon monoxide
C: carbon dioxide
D: oxygen
举一反三
- "Greenhouse gases" in Para. 2 refer to ________________. A: oxygen B: hydrogen C: carbon dioxide D: air
- ( ) is taken in by plants to make food. A: nitrogen B: hydrogen C: oxygen D: carbon dioxide
- The gas with maximum percentage in the atmosphere is ( ). A: nitrogen B: hydrogen C: oxygen D: carbon dioxide
- Scientists figured out that human bodies are basically made of（） A: hydrogen, carbon, nitrogen, and oxygen atoms B: water vapor, ammonia, carbon dioxide, methane and hydrogen C: biomolecules and water D: evolutionary molecules
- Carbon dioxide consists of carbon and （ ） A: oxygen B: emergency C: upgrade D: religious