单项选择题

Mobile telecommunications （） is expected to double in Shanghai this year as a result of a contract signed between the two companies.

A．capacity
B．potential
C．possession
D．impact

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单项选择题
The （） stuck on the envelope says By Air .

A．diagram
B．label
C．signal
D．mark
单项选择题
The twentieth century has witnessed an enormous worldwide political, economic and cultural （）

A．tradition
B．transportation
C．transmission
D．transformation
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