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【单选题】
下图表示一种多层次、多级利用自然资源、实现良性循环的农业生态工程设计:先将农作物的秸秆糖化处理,用以饲养家禽、家畜;取它们的排泄物,用来培养食用菌;收集残留物作为养殖蚯蚓的原料;最后把蚯蚓的残留物,连同排泄物一同送到农田,物尽其用。 请回答问题: 建立这一生态系统的目的是_________。
A.
调整能量流动关系,使之朝向有利于人类的方向发展。
B.
调整能量流动关系,使之朝向有利于动植物保护的方向发展。
C.
改变生态系统机构,使之朝向有利于人类的方向发展。
D.
改变生态系统机构,使之朝向有利于动植物保护的方向发展。
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【单选题】What was Jessica fond of reading when she was young?
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Classics recommended by the school.
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rattle
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define
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glisten
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【单选题】She was reading the newspaper attentively, but she looked _____ the newspaper when she heard the
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【单选题】根据商品( )不同,可将商品分为生活资料商品和生产资料商品。
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【单选题】What was Jessica fond of reading when she was young?
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