问题详情

What is the main idea of this passage？

A．The sea ice changes in Antarctic are different from those in Arctic.

B．Global warming influences the ice coverage at both poles.

C．Maps of sea ice movements around Antarctica and Arctic were made.

D．The melting of Arctic sea ice is faster than the expanding of Antarctic sea ice.

请帮忙给出正确答案和分析，谢谢！