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题型：单选题 题类：常考题 难易度：普通
牛津译林版九年级英语上Unit 1 Know yourself. 单元测试（二）
—Yes. But the medicine will really work soon after you take it.
— I'm afraid not. It's really .
—But it's ______ for your health. You know I often swim in rivers in different seasons.
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