Characteristics That Promote Comprehension

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According to Stephen Krashen, the following practices help promote comprehension (when done by the language teacher): 
 
(1) slower rate and clearer articulation, which helps acquirers to identify word boundaries more easily, and allows more processing time;
(2) more use of high frequency vocabulary, less slang, fewer idioms;
(3) syntactic simplification, shorter sentences.

Do you agree?