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Today, 11:40

The automobile engine is the largest source of (blank) gas.

a. Carbon Monoxide

b. Carbon dioxide

c. Sulfur dioxide

d. Nitrogen dioxide

+2
Answers (2)
  1. Today, 13:02
    0
    I has to be d. Nitrogen Dioxide.
  2. Today, 14:12
    0
    I think that it may be a. Carbon Monoxide
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