单项选择题

Passage Two
Questions 30 to 32 are based on the passage you have just heard.

A．They are tidal waves.
B．They can be caused by the fall of an asteroid into the water.
C．They can not be detected before they hit land.
D．They are harbor waves.

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单项选择题

A．A player of background music.B．A researcher on the function of background music.C．A composer of background music.D．A fan of background music.

A．A player of background music.
B．A researcher on the function of background music.
C．A composer of background music.
D．A fan of background music.

Passage Two Questions 30 to 32 are based on the passage you have just heard. 您的浏览器不支持 audio 元素。

Passage Two
Questions 30 to 32 are based on the passage you have just heard.