单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．A book about computer programming.
B．A book about computer science.
C．A book about natural science.
D．A book about physics.

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单项选择题

单项选择题

Questions 11 to 18 are based on the conversation you have just heard. 您的浏览器不支持 audio 元素。