If you intend to melt the snow for drinking water, you can _____ extra purity by running it through a coffee filter.

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问题 If you intend to melt the snow for drinking water, you can _____ extra purity by running it through a coffee filter.

选项 A、assure
B、insure
C、reassure
D、ensure

答案D

解析空格处意为“您可以用咖啡过滤器过滤融水以——额外纯度。”D项ensure意为“确保”，且后面可以带名词作宾语，代入句意通顺，符合要求，故选D。A项assure意为“使确信，使放心，向……保证”，常用于assure sb．of sth．或assure sb．that结构，如：His doctor has assured us that he’ll be fine．(他的医生已向我们保证他会没事的。)可从用法上排除。C项reassure“使……放心”后也接“人”作宾语，如Teachersreassured anxious parents．(老师焦急的家长放心。)B项insure“给……保险；确保”，表示“给……保险”时，代入空格，句意不通；insure表示“确保”时，是ensure的美式拼法，但选项中有ensure时，优先选ensure。

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专业英语四级

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