单项选择题

The little boy was on the ______ of tears when his teacher asked him what he had done.

A．verge
B．fringe
C．margin
D．rim
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单项选择题
Steady advances in digital memory technology are making mass-storage devices technologically ______ and increasingly cost-effective.
A．eligible
B．sustainable
C．probable
D．feasible
单项选择题
Anti-hunt protestors stayed away from the meeting, preferring to show their support by way of a ______ of more than 5,500 signatures.
A．plea
B．petition
C．resort
D．reproach
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