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The reading passage as dependent exemplification

The presentation of language through reading passages, with appended comprehension questions, is a well-established and very familiar pedagogic practice. But what is the purpose of such passages? When they appear in structurally based courses they seem to be used as a vehicle for usage, to consolidate a knowledge of structure and vocabulary that has already been introduced and to extend this knowledge by incorporating into the passages examples of whatever elements of usage come next in the course. In this case, the passage is intended as a manifestation of selected parts of the language system and in consequence they frequently exhibit an abnormally high occurence of particular structures. It has something of the character of a display case and its value as discourse is decreased accordingly.

(Widdowson, H. G. Teaching Language as Communication. Oxford University Press.)

All sentences are true about the reading passage described, EXCEPT: