单项选择题

We have no figures on the number of workers employed in the ______ stages of iron production.

A．various
B．variable
C．varied
D．variant
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单项选择题
Although the false banknotes fooled many people, they did not ______ close examination.
A．put up
B．keep up
C．stand up to
D．look up to
单项选择题
Psychologists have done extensive studies on how well patients ______ with doctors' orders.
A．comply
B．correspond
C．interact
D．interfere
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