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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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
单项选择题
He wasn't appointed chairman of the committee, （） not very popular with all its members.

A．to be considered
B．considering
C．being considered
D．having considered
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