Passage Summary: Because one flight is as safe as one dental X-ray, people who work on planes every day are not at risk from radiation.

Conclusion: The radiation absorbed by airline flight crews during their work does not pose a significant health risk.

Reasoning: A single commercial flight exposes a person to no more radiation than a single dental X-ray, and a single dental X-ray is considered harmless.

Analysis: This argument falls into a classic trap by ignoring the cumulative effect of repeated exposure. While a single flight might be as harmless as a single X-ray, flight crews fly hundreds of times a year, whereas patients rarely get hundreds of dental X-rays in the same timeframe. Predict an answer that highlights this frequency error—the difference between a one-off event and a career's worth of exposure. It’s the difference between eating one cookie and eating the whole jar.