单项选择题

Questions 23 to 25 are based on the conversation you have just heard.

A．Six hours.
B．Eighteen hours.
C．Sixteen hours.
D．Eight hours.

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Why did the Kendlers conduct the test described in the second paragraph

Questions 23 to 25 are based on the conversation you have just heard. 您的浏览器不支持 audio 元素。