Answer :
Final answer:
The shift in the poem 'Written at the Close of Spring' occurs in line 9, reflecting on human fragility.
Explanation:
The shift in the poem 'Written at the Close of Spring' occurs in line 9: "Ah, poor humanity! so frail, so fair." This line marks a change in tone to reflect on the vulnerability of humanity. The preceding lines primarily focus on the beauty of nature in spring, while line 9 introduces a contemplation on human fragility.
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