Numerical answer
Five sentences related to a topic are given below. Four of them can be arranged into a coherent, meaningful paragraph, while one does not fit. Identify the sentence that does NOT fit (enter only the sentence number).
1. Lighthouses once relied on keepers who lived on site, tending oil lamps and later electric lights through long, isolating shifts.
2. Automation, beginning in the mid-twentieth century, gradually replaced these keepers with timers, photocells and remote monitoring systems.
3. Many decommissioned lighthouses have since been converted into guesthouses, museums, or private residences prized for their dramatic coastal settings.
4. Lighthouse keeping was, by most accounts, a demanding job that required constant vigilance regardless of weather conditions.
5. By the late twentieth century, most lighthouses in developed countries operated with no human presence at all.
1. Lighthouses once relied on keepers who lived on site, tending oil lamps and later electric lights through long, isolating shifts.
2. Automation, beginning in the mid-twentieth century, gradually replaced these keepers with timers, photocells and remote monitoring systems.
3. Many decommissioned lighthouses have since been converted into guesthouses, museums, or private residences prized for their dramatic coastal settings.
4. Lighthouse keeping was, by most accounts, a demanding job that required constant vigilance regardless of weather conditions.
5. By the late twentieth century, most lighthouses in developed countries operated with no human presence at all.
Show answer and solution
Answer: 3
Sentences 1, 4, 2 and 5 form a coherent narrative about the transition from human-operated to automated lighthouses (keepers' working conditions → automation begins → full automation achieved). Sentence 3, about repurposing decommissioned lighthouses into guesthouses or museums, introduces a different topic (post-automation real estate use) that breaks this narrative thread, making it the odd one out.
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