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 ensure“确保”,后面可以带名词作宾语,代入句意通顺,故选D。assure意为“使确信,使放心,向……保证”;reassure“使……安心”后接“人”作宾语;insure“给……保险;确保”,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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