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Radon-210 is more radioactive than Technetium-99. Since Promethium-61 is more radioactive than Protactinium-234, it follows that Radon-210 is more radioactive than Protactinium-234.

Any of the following, if introduced into the argument as an additional premise, makes the argument above logically correct EXCEPT:
  • ATechnetium-99 is more radioactive than Promethium-61. 分析该选项
  • BPromethium-61 and Technetium-99 have equal levels of radioactivity. 分析该选项
  • CPromethium-61 and Radon-210 have equal levels of radioactivity. 分析该选项
  • DPromethium-61 is more radioactive than Radon-210. 分析该选项
  • ETechnetium-99 is more radioactive than Protactinium-234. 分析该选项
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正确答案: D

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