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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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

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

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