单项选择题

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

A．Because it can send email.
B．Because it offers online discussion.
C．Because it is visible and audible.
D．Because it provides chatting servic

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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。