摘要： Bendboth knees when yau pick up the pack, don't just bend ouer the waist(腰). (6) The main idea of the text is ( ) (A) the problems made by rolling backpacks (B) the goodness of backpacks (C) the best backpacks for students (D) how to lighten students' backpacks (7) From what Eblin Reyes and Shirley Park said, we know ( ) (A) students have to carry heavy backpacks (B) students have to do homework (C) backpacks with wheels are bad for students (D) students have no time to play because of homework (8) In the text "switch to" means turn to begin to use (9) By the words of the experts, it's better for a student of 40 kilos to carry a backpack of at most ( ) 8 kilos 7 kilos (10) If students follow the doctor's suggestings, they ( ) (A) may do less homework (B) may feel their backpacks are lighter (C) can learn how to enjoy themselves (D) will know how to use backpacks

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