Acid rain is mentioned in the passage for which of the following reasons? A. It reduces the efficiency of coal-fired plants B. It increases the difficulty of transporting coal C. It is an

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Acid rain is mentioned in the passage for which of the following reasons?

It reduces the efficiency of coal-fired plants

It increases the difficulty of transporting coal

It is an environmental problem associated with coal use

It contains less energy per unit of weight than coal does

Giải thích

Đáp án C

Dựa vào câu “… it is difficult to transport, and it is associated with a host of environmental issues, among them acid rain” → mưa axit là một vấn đề môi trường liên quan đến việc sử dụng than đá.