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Verbal·Craft and Structure·Words in Context
hard
Astronomers analyzing the Sun have discovered an important        between magnetically active and quiet regions. In active regions, bursts of ultraviolet light typically precede significant decreases in magnetic energy, whereas in quiet regions, there is a continuous correlation between ultraviolet light intensity and magnetic energy without significant energy drops.
Which choice completes the text with the most logical and precise word or phrase?
A
analogy
B
trade-off
C
interaction
D
disparity