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答案：D
解析：
Let N equal the population of Norson, and let T equal the entire population of Transitania. Then T-N is the population of the rest of Transitania.
N is 50% of (T-N).
N = (1/2) (T-N), or 2 N = T-N.
This gives 3 N = T, or N = (1/3) T.
So the population of Norson is one third, or 33 and (1/3)%, of the entire population of Transitania.
