单选题：In Paragraph 4 the writer implies that fertile soils are

题目内容：

In Paragraph 4 the writer implies that fertile soils are A．limited.
B．renewable.
C．nonrenewable.
D．productive.

参考答案：

答案解析：

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根据以下材料，回答题American FirmsThe annual review of American company board practices

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