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Verbal·Craft and Structure·Words in Context
easy
Blue holes, such as the Great Blue Hole and Watling’s Blue Hole, are deep sinkholes that form underwater. Because the dark blue appearance of their waters means these pits can be easily        shallow areas around them, where the water looks light blue, many blue holes have been discovered by people doing recreational activities like boating.
Which choice completes the text with the most logical and precise word or phrase?
A
elevated from
B
surpassed by
C
differentiated from
D
explored by