单项选择题

Mainstream pro-market economists all agree that competition is an （） spur to efficiency and innovation.

A．extravagant
B．exquisite
C．intermittent
D．indispensable

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单项选择题
The country was an island that enjoyed civilized living for a thousand years or more with little （） from the outside world.

A．disturbance
B．discrimination
C．irritation
D．irregularity
单项选择题
The term “glass ceiling” was first used by the Wall Street Journal to describe the apparent barriers that prevent women from reaching the top of the corporate （）.

A．seniority
B．superiority
C．height
D．hierarchy
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