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1 . In general, doctors in those days had two________ theories to explain________ ________ ________ .（根据课文内容填空）
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翻译-整句英译汉
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较易(0.85)
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2 . Each year, millions of people around the world get cholera and many die from it. （英译汉）
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翻译-整句英译汉
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适中(0.65)
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3 . Through Snow’s tireless efforts, water companies began to sell clean water and the threat of cholera around the world saw a substantial decrease.(英译汉)
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