单项选择题

It is his ceaseless striving for truth of the undiscovered world that______ him with today's high academic status.

A．ensured
B．attributed
C．authorized
D．endowed
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In times of severe______ companies are often forced to make massive job cuts in order to survive.
A．concession
B．recession
C．Submission
D．conversion
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During his absence, Sophia______ from the showroom and joined her sisters.
A．ascended
B．declined
C．descended
D．plunged
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