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 retired engineer plunked down $50,100 in cash for a midsize Mercedes as a present for his wife--a purchase ______ with money made in the stock the week before.
A．paid off
B．paid through
C．paid out
D．paid for
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
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