单项选择题

Questions 11-13 are based on the following conversation. You now have 15 seconds to read the questions 11-13. According to the conversation, where does thunder occur

A．Where cool air hits mountains.
B．Where lightning occurs.
C．Near electrical wires.
D．Underneath the clouds.

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单项选择题

单项选择题

Questions 11-13 are based on the following conversation. You now have 15 seconds to read the questions 11-13. According to the conversation, where does thunder occur 您的浏览器不支持 audio 元素。