What is the main topic of the passage? A. The changing pollutants in the atmosphere. B. The decreasing pollution of the atmosphere. C. Hydroxyl’s influence on the atmosphere. D. The oxygena

What is the main topic of the passage?

A. The changing pollutants in the atmosphere. 
B. The decreasing pollution of the atmosphere.
C. Hydroxyl’s influence on the atmosphere. 
D. The oxygenation of the atmosphere.

Trả lời

Chọn A

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