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【参考答案】

B
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单项选择题
A．The ride across the West was too hard and dangerous.B．The telegraph system to California was completed.C．It was very difficult to find brave riders.D．People preferred to send their mall by stagecoach.
A．The ride across the West was too hard and dangerous.
B．The telegraph system to California was completed.
C．It was very difficult to find brave riders.
D．People preferred to send their mall by stagecoach.
单项选择题
A．Go to the party.B．Work in a restaurant.C．Do her homework.D．Study English.
A．Go to the party.
B．Work in a restaurant.
C．Do her homework.
D．Study English.
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