48.
(A)The money to be made from ethanol is driving farmers to plant more corn and switch lands from other crops.
(B)Ethanol also can be made from materials such as wood and grasses.
(C)The boom in corn demand helps boost the farm economies in many states.
(D)The ripples of rising corn prices have also spread beyond America's borders.

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統計: A(14), B(29), C(20), D(6), E(0) #678533

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