Passage Summary: If you can concentrate fully, you are definitely smarter than average. Also, learning to speed-read usually helps you concentrate better.

Reasoning: The text establishes a strict conditional rule (Concentration implies Intelligence) and a probabilistic correlation (Speed-reading usually leads to Concentration).

Analysis: In a Must be False question, we are looking for a statement that directly contradicts the established rules. The most rigid rule here is: Full Concentration → Above-Average Intelligence. This means it is impossible for someone to possess the ability to fully concentrate and yet have average or below-average intelligence. Any answer choice describing such a person would be the correct choice because it violates the 'always' condition set forth in the first sentence.