填空题

Although most nations around the world have agreed upon GSM data transmission protocol for cellphones, the US has avoided official ______.

【参考答案】

standardization

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单项选择题

A．To the supermarket.B．To the restaurant.C．To the fitness club.D．To the university.

A．To the supermarket.
B．To the restaurant.
C．To the fitness club.
D．To the university.

填空题

Cellphones must not only be connected to the system of ______ but also must be able to connect with each other just as easily, even if the two phones are not from the same mobile service provider.

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