4. In an ecosystem, energy
(A) cycles along with chemical nutrients.
(B) typically flows from consumers to producers to decomposers.
(C) typically flows from producers through a series of consumers.
(D) comes ultimately from bacteria.

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#6735404
### 1. 題目解析 這道題目主要考察...
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#6735405
題目解析 這道題目考察的是生態系統中能量...
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