填空题

Putting screens over the dam’s drainage holes turned Out to be a fatal mistake —a major error that led to the bursting of the dam.

【参考答案】

N

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The second part of the flood, carrying people, houses, and other things with it, moved swiftly to a bridge that crossed the valley.

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According to the article,______caused the mass of the debris to ignite and the effect was that______.