单项选择题

Huntington and many of its competitors are working to make remedial instruction a commodity as ______ and accessible as frozen yogurt.

A．ubiquitous
B．rational
C．necessary.
D．credible
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单项选择题
The once separate issue of environment and development are now ______ linked.
A．intangible
B．indispensable
C．inextricably
D．incredibly
单项选择题
From Christianity and the barbarian kingdoms of the west emerged the medieval version of politics ______ in turn evolved the politics of our modern world.
A．of which
B．from which
C．on which
D．by which
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