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24 September, 20:08

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

a. Carbon Monoxide

b. Carbon dioxide

c. Sulfur dioxide

d. Nitrogen dioxide

+4
Answers (2)
  1. 24 September, 23:01
    0
    I has to be d. Nitrogen Dioxide.
  2. 24 September, 23:53
    0
    I think that it may be a. Carbon Monoxide
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