49.
(A)Ethanol also can be made from materials such as wood and grass es. 
(B)Just last year alone, the United states produced almost 5 billion gallons of the fuel. 
(C)That number will likely grow 
(D)The ripples of rising corn prices have also spread beyond America's bnorders.

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統計: A(6), B(28), C(27), D(6), E(0) #678534

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