Final answer:
The excerpt from Silent Spring that appeals to pathos emphasizes the potential tragedies that have already occurred, creating an emotive impact on readers.
Explanation:
The excerpt from Silent Spring that best appeals to readers' pathos is: 'Yet every one of these disasters has actually happened somewhere, and many real communities have already suffered a substantial number of them. A grim specter has crept upon us almost unnoticed, and this imagined tragedy may easily become a stark reality we all shall know.' This passage evokes a sense of impending doom and loss, appealing to the readers' emotions and empathy.
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