单项选择题

Passage One Questions 26 to 28 are based on the passage you have just heard.

A．1520.
B．6020.
C．1755.
D．1620.
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单项选择题
A．He’s window shopping.B．Shoes.C．A plan.D．He’s buying everything.
A．He’s window shopping.
B．Shoes.
C．A plan.
D．He’s buying everything.
填空题
Although most nations around the world have agreed upon GSM data transmission protocol for cellphones, the US has avoided official ______.
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