单项选择题

When did you first encounter these difficulties

A．create
B．present
C．experience
D．resolve
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单项选择题
There is a need for radical changes in education.
A．revolutionary
B．long-term
C．short-term
D．systematic
单项选择题
Don’t tempt thieves by leaving valuables clearly visible.
A．alarm
B．catch
C．spot
D．attract
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