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  3. PASSAGE THREE What’s the topic of the passage?

PASSAGE THREE What’s the topic of the passage?

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问题 PASSAGE THREE
What’s the topic of the passage?
选项
答案Defense mechanisms in various forms．
解析 主旨大意题。文章的主题句是…living things have evolved a variety of defense mechanisms for protecting their bodies from invasion by other organisms．由此句可得答案。
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