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【单选题】
“三并流”没有合并成一条河流的原因为（ ）。A.
流水的侵蚀力太小，不能切割动周边的岩石
B.
金沙姑娘三姐妹的故事是真实的
C.
青藏高原的持续使得河流的下蚀作用较强而侧蚀作用较弱。
D.
地貌太高，流水的侵蚀作用较低。
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C.
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B.
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C.
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