Classify portions of text


The following 3 screenshots are taken from an active document where
the student has to classify portions of text. Look at that crazy story, taken
from the example 9 under Try This.

Screenshot 1, the problem

Screenshot 2, after some steps


 

(The screenshot is cut).
 

Screenshot 3, a more explicit version, needing more space
 


.

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The action of the reader and the incident message distinguishes the Active Document (AD).