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答案：E
解析：
The car service uses a total of g gallons of gasoline per week, and each of the cars uses the same amount of gasoline, so each of the c cars uses g/c gallons of gasoline per week. Therefore, 5 of the cars use a total of (5*g)/c gallons per week. It follows that 5 of the cars use (2)*((5*g)/c) equals (10*g)/c gallons of gasoline in 2 weeks.
