填空题

The Johnstown flood is described as an example of a disaster that resulted from the combination ofand .

【参考答案】

too much rain / poor construction and management

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Hundreds of people tried to escape the Johnstown flood by making rafts from pieces of wreckage but none of them survived.

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.

The Johnstown flood is described as an example of a disaster that resulted from the combination of______and ______.