In countries plagued by cholera and other waterborne diseases, attempts at (i)__

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问题 In countries plagued by cholera and other waterborne diseases, attempts at (i)______ water cannot keep pace with its (ii)______.

选项

答案 C，D

解析 cannot说明前后反义重复。两空联动，反义重复。squander浪费，produce生产，purify净化；contamination污染，consumption耗尽，exploration探测。答案选CD。

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