单项选择题

The individual experiencing the beginning of a panic attack usually feels as though he or she is on the ______ of dying or of losing his or her sanity.

A．margin
B．border
C．verge
D．fringe
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单项选择题
The United States is perhaps the country where the ______ spirit is most cultivated and admired.
A．comparative
B．compatible
C．comparable
D．competitive
单项选择题
She had also expressed great anxiety as to who was to ______ her for the loss of her fences and crop.
A．compensate
B．supplement
C．diminish
D．compromise
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