单项选择题

Railways are ______ to the economic prosperity of the country.

A．essential
B．useful
C．reliable
D．preferable
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单项选择题
The concept of a loyal opposition-the ______ of modern democracy —rarely prevails and, much more frequently, opposition is equated with treason and ruthlessly suppressed.(2004年四川大学考博试题)
A．loop
B．essence
C．equivalent
D．velocity
单项选择题
While we plan our railway buildings with a life span of 100 years, we also know that a quake measuring over seven on the Richter scale might______ once in 120 years, though we never expected it to happen so soon.(2006年厦门大学考博试题)
A．appear
B．develop
C．erupt
D．emerge
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