单项选择题

He （）his head, wondering how to solve the problem.

A．scrapped
B．screwed
C．scraped
D．scratched

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单项选择题

All the students have to （）to the roles and regulations of the school.

A．confirm
B．confront
C．confine
D．conform

单项选择题

The Japanese scientists have found that scents （）efficiency and reduce stress among office workers.

A．enhance
B．amplify
C．foster
D．magnify

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