问题描述：
改错 I used to go down to the bank of the stream and chose little flattened stones to throw across
I used to go down to the bank of the stream and chose little flattened stones to throw across the water,which moved as swiftly as swallows
I used to go down to the bank of the stream and chose little flattened stones to throw across the water,which moved as swiftly as swallows
问题解答：
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