【单选题】What is the usage of the Pony Express
A．To help people travel from coast to coast.
B．To train riders for competition.
C．To transfer materials and messages.
D．To arrest criminals in the West.
【单选题】What is the usage of the Pony Express
A．To help people travel from coast to coast.
B．To train riders for competition.
C．To transfer materials and messages.
D．To arrest criminals in the West.
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