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

A．They bought the motorbike.
B．They had no time.
C．They didn’t want a refrigerator.
D．There’s nothing wrong with the old one.

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What happened when the ionized hydrogen became more transparent

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