食物网结构比较简单的生态系统是（ ）

【名词&注释】

美国人(americans)、生态系统(ecosystem)、落叶阔叶林(deciduous broad leaved forest)

[单选题]食物网结构比较简单的生态系统是（ ）

A. 落叶阔叶林
B. 温带草原
C. 淡水湖泊
D. 极地冻原

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学习资料：

[单选题]It can be inferred from the passage that by the end of World War Ⅱ , most Americans ______.

A. were very rich
B. lived in poverty
C. did not own automobiles
D. had own automobiles

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