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答案：B
解析：
Choice B is correct. The recipe calls for a 3:2 ratio of cups of flour to cups of sugar. Set up a proportion to determine how many cups of sugar, s, Francisco should use if he uses 4 cups of flour:
3/2=4/s
Solving this equation for s yields: s=(4/3)*2=8/3
Francisco should use 8/3 cups of flour to maintain the same ratio of flour to sugar.
