必修③ Unit7~8 阶段质量检测 新课标英语北师大版教师用书配套资料

减小字体 增大字体 作者:本站收集整理  来源:本站收集整理  发布时间:2010-11-11 08:02:20
backpacks(背包) with two straps(带子) to carry them 6  a number of other students choose rolling backpacks.

But even with rolling backpacksgetting up stairs and buses with them is  7  a problem for kids.Many of them have hurt their kneesbacks or necks because of heavy school bags.

But how much is too muchExperts say students should carry  8  more than 10 to 15 percent of their own body weight.

Scott Bautcha Wisconsin  9  doctor

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