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 这道题问的是:下面列出的几种陈述哪一种是正确的。D说的是:青尼罗河和白尼罗河是尼罗河的支流。第四段中的最后一句话是这么说的:...worked out what proportion of sediment came from each branch of the river.算出了来自河的每条支流的沉积物的比例。这里的“河”是指“尼罗河”,“每条支流”是指上文所说的“青尼罗河”和“白尼罗河”。因此,D是正确的答案。A:白尼罗河是尼罗河的干流。B:白尼罗河是青尼罗河的干流。C:白尼罗河是青尼罗河的支流。显然,这些都不构成答案。
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