问题
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What does the underlined word“collapsed” probably mean？ （)A． Were destroyedB． Caught fire
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What does the word precursor in the context in the second paragraph mean？
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What does the word "defensive" mean in the passage？ 查
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What does the word "integration" in the last paragraph probably mean？A．Host countries coop
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What does the word“bottlenecks”(Para.2)mean in th
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What does the word“defensive”mean in the passage?
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