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Today, smallpox, polio, typhoid and measles are no longer common because most people have been protected by _______.

Today, smallpox, polio, typhoid and measles are no longer common because most people have been protected by _______.

发布时间：2025-03-13 03:42:50

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答案：vaccines 【分析】:Unit 2 Reading：Part 2，第3小节最后一句。

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