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LIYAQI LIYAQI
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6 years ago
In an ideal study session (as described in the text), students are in deep concentration for:
 
  a. 20 minutes
 b. 30 minutes
 c. 40 minutes
 d. 50 minutes
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indian394indian394
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6 years ago
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Thank you, thank you, thank you!
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Helped a lot
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