What is the main idea of the new item?A.How to use solar energy.B.An introduction to a ren

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What is the main idea of the new item?

A.How to use solar energy.

B.An introduction to a renovation.

C.How to live in balance with environment.

D.Cooperation between two countries to solve energy crisis.

请帮忙给出正确答案和分析,谢谢!

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