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
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单项选择题
Since colonial times, black people in South Africa have been ______ by the white minority.
A．depressed
B．suppressed
C．oppressed
D．repressed
单项选择题
It is unreasonable to battle the ______ by increasing the tariff rate.
A．disposition
B．discrepancy
C．defect
D．deficit
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