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【单选题】
What detail in the article shows how the hats stay on the birds' heads?A.
They were wearing little cowboy hats.
B.
Glue was used to keep the hats on.
C.
He was trying to get the hat off, she said.
D.
Still, no one knows who put the hats on the birds.
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【简答题】按照统计数据的收集方法,可以将其分为()和()。
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分类数据、顺序数据和数值型数据
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