单项选择题

There are several theories as to why the dinosaurs become ______.

A．extinct
B．credible
C．distinct
D．esthetic
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单项选择题
The boss' s promise to increase the workers' pay was a ______ to union demands.
A．concession
B．recession
C．submission
D．commission
单项选择题
They are well ______ with each other since they once studied in the same university
A．informed
B．accustomed
C．acknowledged
D．acquainted
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