单项选择题

Questions 29 to 31 are based on the passage you have just heard.

A．Off the Big Island.
B．Near Challis.
C．In Coalinga.
D．Off the southern coast.

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单项选择题

单项选择题

Questions 29 to 31 are based on the passage you have just heard. 您的浏览器不支持 audio 元素。