题目信息
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:
Any of the following, if introduced into the argument as an additional premise, makes the argument above logically correct EXCEPT:
A:Technetium-99 is more radioactive than Promethium-61.
B:Promethium-61 and Technetium-99 have equal levels of radioactivity.
C:Promethium-61 and Radon-210 have equal levels of radioactivity.
D:Promethium-61 is more radioactive than Radon-210.
E:Technetium-99 is more radioactive than Protactinium-234.
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正确答案：
D:Promethium-61 is more radioactive than Radon-210.
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