Carbon dioxide content of normal air is:( )
A: 0.03℅
B: 0.30%
C: 23.3%
D: 78.3%
A: 0.03℅
B: 0.30%
C: 23.3%
D: 78.3%
举一反三
- Plants （ ） carbon dioxide from the air and moisture from the soil.
- "Greenhouse gases" in Para. 2 refer to ________________. A: oxygen B: hydrogen C: carbon dioxide D: air
- The main air pollutants include : particulate matter, Ground-level ozone, Nitrogen dioxide, sulfur dioxide, carbon monoxide and lead.
- Trees absorb carbon dioxide from the air, which can increase greenhouse gases.
- Geothermal energy brings air emissions including( ). A: carbon dioxide B: all the options C: hydrogen sulfide D: methane