There are 64 identical cubes with side of 1. Only one face of each cube is painted. These 64 cubes will be put together into a big cube. What's the maximum proportion of painted sides on the surface of this big cube?
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A$$\frac{1}{2}$$
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B$$\frac{2}{3}$$
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C$$\frac{3}{4}$$
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D$$\frac{4}{5}$$
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E$$\frac{7}{12}$$
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正确答案: E