职教组卷基于海量职教高考试题库建立的在线组卷及学习系统

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当前：英语

题型：选择题题类：单元测试难易度：难

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A(n)_________can be described________ the soil, rocks, plants, animals, water, climate, land, and all the processes that link these things together.

A. prairie; as B. ecosystem; of C. ecosystem; as D. prairie; for

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