There are 64 unit cubes in total. Only one side of each cube is painted. These unit cubes will be put together into a big cube. What's the maximum proportion of painted sides on the surface of the big cube?
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A$$\frac{1}{2}$$
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B$$\frac{2}{3}$$
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C$$\frac{5}{12}$$
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D$$\frac{7}{12}$$
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E$$\frac{9}{16}$$
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正确答案: C