What does the passage mainly discuss? [br] The word "it" in line 21 refers toA

游客2025-02-09 11

问题 What does the passage mainly discuss? [br] The word "it" in line 21 refers to

选项 A、biological productivity
B、oil
C、organic material
D、petroleum

答案 C

解析

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Whatdoesthepassagemainlydiscuss?[br]Theword"prolific"inline16isc