What is the main idea of this passage？A．The Ice Age was a long period of time.B．Great glac

What is the main idea of this passage？

A．The Ice Age was a long period of time.

B．Great glaciers covered North America many years ago.

C．Changes in climate helped to melt the glaciers.

D．How glaciers changed North America.

请帮忙给出正确答案和分析，谢谢！

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