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.
International edition of textbook ______.

A．is not sold in US
B．has all the contents similar to that of an US edition
C．is from overseas
D．all of the above

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单项选择题

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. International edition of textbook ______. 您的浏览器不支持 audio 元素。