6.The unique bugs, black soldier fly larvae, transform food waste into nutrient-rich ___________, which can help restore soil biodiversity and quality.
(A) pesticide
(B) biofertilizer
(C) herbicide
(D) preservative

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統計： A(1), B(11), C(1), D(0), E(0) #3427164

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#6380545
這題關鍵句是： black sold...
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