Question ID:PT33 S3 Q5 Passage:The radiation absorbed by someone during an ordinary commercial airline flight is no more dangerous than that received during an ordinary dental X-ray. Since a dental X-ray does negligible harm to a person, we can conclude that the radiation absorbed by members of commercial airline flight crews will also do them negligible harm. Stem:A flaw in the argument is its failure to consider that Correct Answer Choice:DChoice A:there may be many forms of dangerous radiation other than X-rays and the kinds of radiation absorbed by members of commercial airline flight crews Choice B:receiving a dental X-ray may mitigate other health risks, whereas flying does not Choice C:exposure to X-rays of higher intensity than dental X-rays may be harmful Choice D:the longer and the more often one is exposed to radiation, the more radiation one absorbs and the more seriously one is harmed Choice E:flying at high altitude involves risks in addition to exposure to minor radiation