单项选择题

A．Because Mary broke his glass and didn’t say sorry to him.
B．Because he broke Mary’s glass.
C．Because Mary didn’t answer his question politely.
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单项选择题
The technology of fingerprints ______.
A．will be used widely in people's work and life
B．always works
C．are used to help scientists to compete in their computer researches
D．helped the FBI to keep track of the terrorist of the March 2004 bombing at a train station in Madrid
单项选择题
______ helped them to live a better life than most people of that time.
A．The knowledge of time
B．The knowledge of tools
C．The knowledge of about nature and the world
D．The knowledge of numbers
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