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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单项选择题
Bill Gates and Walt Disney are two people America has ______ to be the Greatest American.
A．nominated
B．nicknamed
C．appointed
D．appeased
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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