题目

The group of students went to the suburb, did some research work, and ________ the water in the river to see if it had been polluted.A. proved          B. boiled           C. tested          D. exchanged 答案：C 解析：test表示“测试；测验”，以确认是否合格。prove意为“证明”；boil意为“煮沸”；exchange意为“交流；交换”。

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