单项选择题

Questions 18 to 20 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 professor, what cause the growth of the US economy about 200 years ago

A．The new technology used to build roads.
B．The ability to transport goods over land.
C．The trade in grain and cotton.
D．The linking of smaller local roads into one long road.
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单项选择题
What does the speaker ask the students to write down next
A．Places where T-shirts are not acceptable.
B．Images that are currently printed On T-shirts.
C．Names of people who have made T-shirts popular.
D．Ways that T-shirts represent American culture.
单项选择题
What’s the talk mainly about
A．The advantages of an economy based on farming.
B．Reasons farmers continued using river transportation.
C．The role of cotton in the United States economy.
D．Improved methods of transporting farm crops.
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