A: carbon dioxide
B: all the options
C: hydrogen sulfide
D: methane
举一反三
- Geothermal energy brings air emissions including（ ）.
- "Greenhouse gases" in Para. 2 refer to ________________. A: oxygen B: hydrogen C: carbon dioxide D: air
- 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
- What will the newly-launched observation satellite do? A: It will record carbon dioxide emissions and absorption worldwide. B: It will identify carbon dioxide emission sources with higher efficiency. C: It will monitor carbon dioxide levels in Earth’s atmosphere. D: All of the above.
- The synonym of CO2 is .（ ）。 A: hydrogen B: carbon monoxide C: carbon dioxide D: oxygen
内容
- 0
中国大学MOOC: However, this kind of energy will (7) ________ plenty of greenhouse gases, such as carbon dioxide, methane, (8) ________ vapor and so on.
- 1
Why is more earth's heat blocked from escaping with more carbon dioxide in the atmosphere A: Carbon dioxide prevents the sun's energy from going back into space. B: Carbon dioxide radiates the sun's energy onto the earth. C: Carbon dioxide produces more heat in the atmosphere. D: Carbon dioxide takes in the sun's energy at infra-red wavelengths.
- 2
Solar panels, wind turbines, hydro power and geothermal energy and hydrocarbons (natural gas or coal) can all be used to produce hydrogen (a primary energy).
- 3
Greenhouse gases include . A: carbon dioxide B: CFCs C: methane D: nitrous oxide
- 4
( ) is taken in by plants to make food. A: nitrogen B: hydrogen C: oxygen D: carbon dioxide