单项选择题

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

A．Intelligence section.
B．Cargo transfers on airplanes.
C．Telecommunication hardware moving.
D．Data collecting techniqu

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单项选择题

单项选择题

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。