单项选择题

They aim to ______ the maximum economic benefit from the Olympic Games.

A．contract
B．distract
C．extract
D．subtract

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单项选择题

It is hoped that the prisoner will be released through the ______ of the president himself.

A．intrusion
B．interruption
C．intervention
D．interference

单项选择题

Recent changes in climate may ______ that global warming is starting to have an effect.

A．exemplify
B．witness
C．signify
D．swear

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