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单选题
22.If you intend to melt the snow for drinking water, you can（ ）extra purity by running it through a coffee filter.
A
A. assure
B
B. insure
C
C. reassure
D
D. ensure
答案解析
正确答案：D
解析：
考查同根词。assure 保证，用来表示向人保证某事将要发生，既可以用来确证某事，也可以表示使某人相信，assure 的宾语一般是人或人称代词，一般不直接跟 sth.或that 从句，其常用结构是assure sb. of sth./assure sb. that 从句； insure 为...投保；reassure 使安心， 使消除疑虑；ensure 保证，确保，用来表示使某行为或某件事的结果得以保证，即确保某事发生，常用结构为 ensure sth./ensure that 从句/ensure sb.sth.。
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