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Nightjars possess a camouflage perhaps unparalleled
in the bird world: by day they roost hidden in shady
woods, so ------- with their surroundings that they are
nearly impossible to -------.
(A) vexed . . dislodge
(B) blended . . discern
(C) harmonized . . interrupt
(D) impatient . . distinguish
(E) integrated . . classify