单项选择题

Einstein, like other great physicists before him, worked out new theories that challenge our （） concept of the universe.

A．existed
B．established
C．organized
D．adjusted

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单项选择题
The headmaster warned him to （） his ways if he wanted to stay at the school.

A．repair
B．restore
C．mend
D．protect
单项选择题
The police are trying to find out the （） of the woman killed in the traffic accident.

A．evidence
B．recognition
C．status
D．identity
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