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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

Answer :

moley
B) Blended ... Discern.

Blended can mean to camouflage, meaning that the bird would be well hidden in its surroundings.

To discern would mean to be able to identify it apart from its surroundings.

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