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| How often do you read book? |
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| Which method do you prefer when you read a book? |
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| How long that you usually read the books? |
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| Do you feel your eyes are tired when you read article or book using tablet or some electronic devices? |
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| Do you ever use e-book reader before? |
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| Which methods do you prefer when you study, paper-based book or e-reader? |
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