单项选择题

A．challenge
B．threat
C．problem
D．temptation
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单项选择题
A．lookedB．viewedC．receivedD．perceived
A．looked
B．viewed
C．received
D．perceived
单项选择题
A．althoughB．lestC．unlessD．since
A．although
B．lest
C．unless
D．since
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