What is the main topic of the article?

Question 1

A. Alternative energy sources

Answer

A. Alternative energy sources

Question 2

C. The opening of a new factory

Answer

C. The opening of a new factory

Question 3

D. The future of car companies

Answer

D. The future of car companies

Question 4

B. Environmentally friendly cities

Answer

B. Environmentally friendly cities

Câu hỏi: What is the main topic of the article?