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10 April, 19:51

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

a. Carbon Monoxide

b. Carbon dioxide

c. Sulfur dioxide

d. Nitrogen dioxide

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Answers (2)
  1. 10 April, 19:59
    0
    I think that it may be a. Carbon Monoxide
  2. 10 April, 20:21
    0
    I has to be d. Nitrogen Dioxide.
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