单项选择题

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

A．The internet address.
B．A giant network of computers.
C．An electronic mail.
D．The US postal service.

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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。