单项选择题

The most serious block to concentration is the ______ which comes not from outside but from within.

A．intermission
B．involvement
C．interruption
D．intervention
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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
单项选择题
A ______ change in the market structure during this period was the downsizing of the call market from 3.5 billion dollars to 2 billion dollars, or a decline of approximately 40 percent.
A．conspicuous
B．rigorous
C．turbulent
D．notorious
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