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【单选题】
世界上最古老的四大自源文字中,唯一沿用至今的文字是
A.
楔形文字
B.
埃及文字
C.
汉字
D.
玛雅文字
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B.
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A.
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B.
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A.
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B.
该二叉树中有51个度为2的结点
C.
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D.
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A.
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B.
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C.
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D.
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