单选题：Paragraph 5_______

题目分类：理工类
题目类型：单选题
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题目内容：

Paragraph 5_______ A．What can we do to help protect ecosystems?
B．What are different types of ecosystems?
C．What is an ecosystem?
D．What destroys ecosystems?
E．How does an ecosystem work?
F．Why are ecosystems important?

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