题目内容
（请给出正确答案）
[主观题]
听力原文：Thank you for calling Portable Telecommunications. If you know your party's exten
sion, you may dial it at any time. If you would like to speak with a customer service representative, please stay on the line, and a representative will answer your call in the order it was received. If you'd like more information about Portable Telecom's new XT 5000 mobile phone with GPS, Internet browsing, and the highest megapixel camera on the market, please press "one." Again, thank you for holding the line; a customer service representative will be with you shortly.
What business is mentioned？
A．A bank
B．A travel agent
C．An electric company
D．A telecommunications firm
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