单项选择题

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.
What is the passage mainly about

A．Education in the U.S.
B．The school system in the U.S.
C．Summer holidays in the U.S.
D．Year-round schooling in the U.S.

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单项选择题

单项选择题

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. What is the passage mainly about 您的浏览器不支持 audio 元素。