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

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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