What does the professor mainly discuss?A.The development of the modern skyscraper.B.The sk

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What does the professor mainly discuss?

A.The development of the modern skyscraper.

B.The skyscraper"s effect on urban areas.

C.Problems with future skyscraper construction.

D.Safety regulations for skyscraper design.

请帮忙给出正确答案和分析,谢谢!

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