单项选择题

A cartel is (an association) of producers in a (given) industry (whose) purpose is (restrict) competition.

A．an association
B．given
C．whose
D．restrict
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单项选择题
Good research involves (more) merely (gathering) information; (it) is (essentially) a thinking activity.
A．more
B．gathering
C．it
D．essentially
单项选择题
Birds (whose) coloring blends in with the leaves (do not) seen (as easily as) (those) with brighter feathers.
A．whose
B．do not
C．as easily as
D．those
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