An efficient reader doesn't have to have and use the background knowledge to help his understanding of the text.
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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.
Information-gap activity is a type of excellent way to make speaking tasks communicative, in which students practice to obtain information from each other in order to fulfill tasks.
Controlled activities mainly focus on meaning and communication.