单项选择题

The （） stuck on the envelope says "By Air".

A．diagram
B．label
C．signal
D．mark

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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

单项选择题

（） energy under the earth must be released in one form or another, for example, an earthquake.

A．Accumulated
B．Gathered
C．Assembled
D．Collected

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