单项选择题


A．occurrence
B．situation
C．state
D．case
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单项选择题
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.
单项选择题
How long did the Pony Express exist
A．61 yeah,
B．6 months,
C．One year.
D．18 months.
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