单项选择题

Questions 11 -13 are based on the following passage. You now have 15 seconds to read questions 11 -13.
What is the passage mainly about

A．American consumers.
B．American seller-producers.
C．American economic system.
D．American price system.

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单项选择题

单项选择题

Questions 11 -13 are based on the following passage. You now have 15 seconds to read questions 11 -13. What is the passage mainly about 您的浏览器不支持 audio 元素。