单项选择题

A．A bank teller and a patron.
B．An accounts manager and a customer.
C．A sales clerk and a shopper.
D．A stock broker and a client.
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填空题
The Johnstown flood is described as an example of a disaster that resulted from the combination of______and ______.
填空题
Hundreds of people tried to escape the Johnstown flood by making rafts from pieces of wreckage but none of them survived.
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