优优班--学霸训练营 > 知识点挑题
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            • 1. ______ , smart phones(3) ______ a great(4) ______ (5) ______ people's life. People can hardly stay without them. Teenagers have to (6) ______ (7) ______ have a rest after they(8) ______ (9) ______ for several hours, because their eyes (10) ______ . Some of them even can't see (11) ______ (12) ______ (13) ______ and feel great(14) ______ in the other.
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