共享题干题 （一）Some Schooling on Backpack 回答下列问题。 According to the U.S. Consumer Product Safety Commission, 5,900 kids were treated at hospital emergency rooms, clinics, and doctors' offices last year for sprains ( 扭伤 ) and strains caused by backpacks. Such injures are so widespread that more than 70 percent of physicians as a potential clinical problem for children. How do you avoid such problems? Choose bags that have wide, padded straps (有垫的背带 ) and a belt. That will help transfer some of the weight from the back and shoulders to the hips. You should also tighten both straps firmly, so the pack rests about 2 inches above your waist. Also, remember to pack your bag with the heaviest items closest to your back and to bend both knees when you pick it up.How much should you stuff into your pack? That depends on your size and strength, but a general rule is not to exceed 20 percent of your body weight. So if a child weights 100 pounds, the backpack and its load should not be more than 20 pounds. One hint: Make frequent trips to your locker ( 储物柜) to exchange books between classes. Backpacks with wheels let you pull the weight along the ground, but they have problems too. Many are larger than the average shoulder bag, so students are tempted to carry more than they would in a conventional pack. Roller bags often don't fit into a locker. They can also lead to tripping and falls in crowded halls. Whatever you use, 10 or 15 minutes of stretching and back strengthening is a good idea.1.[不定向选择题]A 10-15 minutes' exercise will help you bear a heavier backpack.A.Right B.Wrong C.Not mentionedABC确定 2.[不定向选择题]Children should put all the books in their lockers.A.Right B.Wrong C.Not mentionedABC确定
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1.参考答案：A
参考解析：根据文章最后一段最后一句话，10到15分钟的练习拉伸会让背部更加强壮。因此也就是说练习是为了可以让自己的承重力更强，可以背更重的包了。
2.参考答案：B
参考解析：根据文章，第三段第三句话，在课间大家可以频繁的到储物柜去换书，因此并没有将所有的书都放在储物柜里。3.[不定向选择题]Roller bags tend to be heavier than ordinary backpacks.A.Right B.Wrong C.Not mentionedABC确定