"The drought of March has pierced unto the root..."
See in text (The General Prologue - The General Prologue)
Note that these opening lines are written as a rhyming couplet, with the words "fruit" and "root" establishing an AA rhyme scheme. Additionally, each line is written in iambic pentameter, which consists of five pairs of one stressed and one unstressed syllable. The Canterbury Tales is written almost entirely in rhyming couplets and iambic pentameter, with a few exceptions.