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

She possessed a quick mind, a sharp tongue and ______ a strong will.

[A] above all
[B] first of all
[C] most of all
[D] and all

单项选择题

They are sure they have all the facts they need to ______ the existence of a black hole.

[A] obtain
[B] maintain
[C] verify
[D] display

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