单选题：According to the speaker, what may be one reason for the suc

题目分类：专四
题目类型：单选题
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题目内容：

According to the speaker, what may be one reason for the success of the merchant ships of the United States? A．They were protected by a strong United States Navy.
B．They were supported by a well-developed railroad.
C．Most crew members had experience on foreign ships.
D．As part owners of the ships, captains got some of the profits.

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