39. Which of the following can be inferred from the reading?
(A) Primary decomposers can digest entire leaves, while secondary decomposers cannot.
(B) Composting requires only secondary decomposers.
(C) Primary decomposers cannot decompose proteins, sugar, or fats.
(D) Secondary decomposers come from the leaf surfaces.

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統計: A(18), B(9), C(24), D(275), E(0) #2751894

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