The people for the experiment were chosen completely ______.

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问题 The people for the experiment were chosen completely ______.

选项 A、at length
B、in essence
C、at random
D、in bulk

答案C

解析 confirm证实。句意：新的数据证实臭氧成层的破坏并不限于南半球。ratify批准，许可；assure保证；approve同意，赞成。

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