With a bottom-up reading, teachers should teach the background knowledge first so that students equipped with such knowledge will be able to guess meaning from the text.
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Teachers should help to develop students reading strategies and skills, and help the students to read on their own.
An efficient reader doesn't have to have and use the background knowledge to help his understanding of the text.
An efficient reader use different speeds for different types of texts, and, use different skills and strategies for different reading tasks.
Reading aloud is to practice skills of pronunciation and intonation. However, silent reading is to practice the reading skills of skimming, scanning, predicting, etc.