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
It is a myth that the law permits the Food and Drug Administration to ignore requirements for ______ drugs while brand-name drugs still must meet these rigid tests.
A．specific
B．generic
C．intricate
D．acrid
单项选择题
If they think they are going to win over us by obstinately ______ and refusing to make the shghtest concession, they are mistaken.
A．holding out
B．holding to
C．holding over
D．holding up
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