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单选题

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.

参考答案D

解析:According to the professor, what may be one reason for the success of the merchant ships of the United States?
细节题。教授提到And since sea captains often became part owners of their ships，they had a strong interest in the commercial SUCCESS of their voyages．即“由于船长是他们船只的部分拥有者，因此他们对于航行中的商业成功有强烈兴趣”。因此，正确答案为D。

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单选题

A．They carried passengers but not cargo.
B．They were large, but surprisingly fast.
C．They were the first successful steam-powered ships.
D．They were more reliable than other ships of the 1860's.

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单选题

A．It's now taught with the aid of computers.
B．It isn't considered as important today as it was in the past.
C．Children today learn it earlier than children did in the past.
D．A lot of times is spent teaching it.

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单选题

A．To indicate the emphasis teachers once placed on penmanship.
B．To criticize a technique used to motivate children.
C．To illustrate the benefits of competition.
D．To suggest that teachers be recognized for their efforts.

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