Why does the author mention "pyramid builders"? Which of the following statements is true?

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问题 Why does the author mention "pyramid builders"?
Which of the following statements is true?

选项 A、The White Nile is the trunk of the River Nile.
B、The White Nile is the trunk of the Blue Nile.
C、The White Nile is a branch of the Blue Nile.
D、The White Nile and the Blue Nile are branches of the River Nile.

答案D

解析题意：下列陈述哪一项是正确的?青尼罗河和白尼罗河是尼罗河的支流。第四段最后一句话提到了“青尼罗河的泥浆与白尼罗河的泥浆的同位素不同。通过分析尼罗河三角洲的泥浆的同位素差别，利兹大学的迈克尔·克罗姆算出了来自每个支流的沉淀物的比例”，由此可推断出青尼罗河和白尼罗河是尼罗河的支流，故选D。

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