Final answer:
The line 'Double, double, toil and trouble' from Shakespeare's Macbeth consists of trochees, not iambs.
Explanation:
The line 'Double, double, toil and trouble' from Shakespeare's Macbeth is composed of trochees. Trochees are two-syllable feet with a pattern of stressed and unstressed syllables (boom-ba), differing from iambs, which have an unstressed followed by a stressed syllable (ba-boom).
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