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. (2017-22)

If you intend to melt the snow for drinking water, you can_____extra purity by running it through a coffee filter. (2017-22)

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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. (2017-22)
选项 A、assure
B、insure
C、reassure
D、ensure
答案D
解析 ensure表示“确保，保证”，通常用于以下句型：ensure sth．，ensure sb．sth．，ensure+(that)从句，此句指确保某事，侧重使人相信某个行为或力量产生的结果。assure尤指“(为消除忧虑)确定地对……说，向……保证”，侧重消除某人思想上的怀疑或担心，常用用法为assure sb．of sth．，assure sb+(that)从句；insure意为“(为……)投保”，通常和介词against搭配；reassure指“安慰焦虑不安的人使其打消疑虑”，常用结构为reassure sb．about sth．或reassure sb．+(that)从句。
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