PASSAGE THREE [br] What’s the topic of the passage?Defense mechanisms in various

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问题 PASSAGE THREE [br] What’s the topic of the passage?

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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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PASSAGEFOURThemaintroubleisfinancing．事实细节题。本题答案可从Themaintrouble，asappear