单项选择题

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

A．extravagant
B．indispensable
C．intermittent
D．exquisite
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单项选择题
With its own parliament and currency and a common ______ for peace, the European Union declared itself-in 11 official languages-open for business.
A．assimilation
B．aspiration
C．inspiration
D．intuition
单项选择题
If we continue to ignore the issue of global warming, we will almost certainly suffer the ______ effects of climatic changes worldwide.
A．trivial
B．dubious
C．toxic
D．drastic
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