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
backpacks(背包) with two straps(带子) to carry them, 6 a number of other students choose rolling backpacks.
But even with rolling backpacks,getting up stairs and buses with them is
But how much is too much?Experts say students should carry 8 more than 10 to 15 percent of their own body weight.
Scott Bautch,a Wisconsin 9 doctor,
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