单项选择题

The review of literature section allows plenty of space for discussing the many ______of the problem and related research.

A．fashions
B．frontiers
C．facets
D．formats
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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
Fuel scarcities and price increases______ automobile designers to scale down the largest models and to develop completely new lines of small cars and trucks.
A．persuaded
B．prompted
C．imposed
D．enlightened
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