Numerical answer
Five sentences related to a common theme 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 and key in its number as your answer.
1. Lighthouses once relied entirely on human keepers, who maintained the lamp, logged weather conditions, and often lived in near-total isolation for months at a time.
2. Automation arrived gradually, with electric lamps and timer mechanisms slowly replacing the manual tasks keepers had performed for generations.
3. Many decommissioned lighthouses have since been converted into guesthouses, offering visitors a taste of the keeper's isolated life without its hardships.
4. By the late twentieth century, most coastal lighthouses had been fully automated, and the last resident keepers were reassigned or retired.
5. Modern maritime navigation increasingly relies on satellite positioning systems, making even automated lighthouses less critical than they once were.
1. Lighthouses once relied entirely on human keepers, who maintained the lamp, logged weather conditions, and often lived in near-total isolation for months at a time.
2. Automation arrived gradually, with electric lamps and timer mechanisms slowly replacing the manual tasks keepers had performed for generations.
3. Many decommissioned lighthouses have since been converted into guesthouses, offering visitors a taste of the keeper's isolated life without its hardships.
4. By the late twentieth century, most coastal lighthouses had been fully automated, and the last resident keepers were reassigned or retired.
5. Modern maritime navigation increasingly relies on satellite positioning systems, making even automated lighthouses less critical than they once were.
Show answer and solution
Answer: 3
Sentences 1, 2, 4 and 5 trace a coherent chronological and causal thread: keepers → gradual automation → full automation → satellite navigation reducing lighthouses' relevance further. Sentence 3, about lighthouses becoming guesthouses, is a real but tangential fact that breaks this thread on automation and navigational relevance; it does not connect to the technological progression the other four sentences build.
Saved on this device. Sign in or create a free account to keep it on every device.