What aspect of North America does the passage mainly discuss? How did glacial meltdown affect the soil in North America?

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问题 What aspect of North America does the passage mainly discuss?
How did glacial meltdown affect the soil in North America?

选项 A、It redistributed the soil types
B、It added salt to the soil
C、It made the soil more neutral in content
D、It added minerals to the soil

答案D

解析

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