Questions 11 to 13 are based on the
following passage. At the end of the passage, you will be given 15 seconds to
answer the questions. Now, listen to the
passage.
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.