③ Pack smart. The heavier things should be packed closed to the back.

　　④ Bend both knees when you pick up the pack, and dont just bend over at the waist (腰).

　　1._____ is the main idea of the text.

　　A.The problem of backpacks is worth studying　B.The problem made by heavy backpacks

　　C.What is the best backpack for a student　D.How to make students backpacks light

　　2.According to Enderlin Reyes and Shirley Park, we know ______.

　　A.students have to do too much homework　

　　B.backpacks have to carry heavy backpacks

　　C.backpacks without wheels are bad for students

　　D.too much homework leaves students no free time

　　3.The expression switched to in the text perhaps means ______.

　　A. started to use B. turned to C. caught up D. used for

　　4.According to the passage, its better for a student of 40 kilograms to carry a backpack of _____ at most by the words of experts.

　　A. 10 kg B. 8 kg C. 6 kg D. 7 kg

　　5.If students follow the doctors suggestions they ______.

　　A.may lighten their backpacks　B.can learn how to help themselves

　　C.may feel their backpacks are lighter　D.will know how to wear backpacks

　　【答案与解析】

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