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Option 2: "walking round"
Explanation: This option is correct as it aligns with the context of the text, which discusses the limitations of the robots. The mention of the robots lacking legs implies they cannot walk, making 'walking round' a fitting completion for the sentence.
Option 1: "acting differently"
Explanation: This option suggests a behavior that is not supported by the text. The focus is on the physical capabilities of the robots, particularly their lack of legs, rather than their behavioral differences.
Option 3: "appearing elsewhere"
Explanation: While this option might seem plausible, it does not directly relate to the physical limitations mentioned in the text. The robots are designed to mimic human appearance but do not possess the ability to move or appear in different locations.
Option 4: "discussing politics"
Explanation: This option is incorrect as it introduces a topic unrelated to the text. The focus is on the robots' physical capabilities and their design, not on any conversational topics they might engage in.
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